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Available in 36 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-36" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">36 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Natriumsulfiet" title="Natriumsulfiet – Afrikaans" lang="af" hreflang="af" data-title="Natriumsulfiet" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%83%D8%A8%D8%B1%D9%8A%D8%AA%D9%8A%D8%AA_%D8%A7%D9%84%D8%B5%D9%88%D8%AF%D9%8A%D9%88%D9%85" title="كبريتيت الصوديوم – Arabic" lang="ar" hreflang="ar" data-title="كبريتيت الصوديوم" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Natrium_sulfit" title="Natrium sulfit – Azerbaijani" lang="az" hreflang="az" data-title="Natrium sulfit" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%B3%D9%88%D8%AF%DB%8C%D9%88%D9%85_%D8%B3%D9%88%D9%84%D9%81%DB%8C%D8%AA" title="سودیوم سولفیت – South Azerbaijani" lang="azb" hreflang="azb" data-title="سودیوم سولفیت" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%B8%E0%A7%8B%E0%A6%A1%E0%A6%BF%E0%A6%AF%E0%A6%BC%E0%A6%BE%E0%A6%AE_%E0%A6%B8%E0%A6%BE%E0%A6%B2%E0%A6%AB%E0%A6%BE%E0%A6%87%E0%A6%9F" title="সোডিয়াম সালফাইট – Bangla" lang="bn" hreflang="bn" data-title="সোডিয়াম সালফাইট" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target"><span>বাংলা</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Sulfit_de_sodi" title="Sulfit de sodi – Catalan" lang="ca" hreflang="ca" data-title="Sulfit de sodi" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Si%C5%99i%C4%8Ditan_sodn%C3%BD" title="Siřičitan sodný – Czech" lang="cs" hreflang="cs" data-title="Siřičitan sodný" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Natriumsulfit" title="Natriumsulfit – German" lang="de" hreflang="de" data-title="Natriumsulfit" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%98%CE%B5%CE%B9%CF%8E%CE%B4%CE%B5%CF%82_%CE%BD%CE%AC%CF%84%CF%81%CE%B9%CE%BF" title="Θειώδες νάτριο – Greek" lang="el" hreflang="el" data-title="Θειώδες νάτριο" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Sulfito_de_sodio" title="Sulfito de sodio – Spanish" lang="es" hreflang="es" data-title="Sulfito de sodio" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Natria_sulfito" title="Natria sulfito – Esperanto" lang="eo" hreflang="eo" data-title="Natria sulfito" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B3%D8%AF%DB%8C%D9%85_%D8%B3%D9%88%D9%84%D9%81%DB%8C%D8%AA" title="سدیم سولفیت – Persian" lang="fa" hreflang="fa" data-title="سدیم سولفیت" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Sulfite_de_sodium" title="Sulfite de sodium – French" lang="fr" hreflang="fr" data-title="Sulfite de sodium" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%95%84%ED%99%A9%EC%82%B0_%EB%82%98%ED%8A%B8%EB%A5%A8" title="아황산 나트륨 – Korean" lang="ko" hreflang="ko" data-title="아황산 나트륨" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%86%D5%A1%D5%BF%D6%80%D5%AB%D5%B8%D6%82%D5%B4%D5%AB_%D5%BD%D5%B8%D6%82%D5%AC%D6%86%D5%AB%D5%BF" title="Նատրիումի սուլֆիտ – Armenian" lang="hy" hreflang="hy" data-title="Նատրիումի սուլֆիտ" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B8%E0%A5%8B%E0%A4%A1%E0%A4%BF%E0%A4%AF%E0%A4%AE_%E0%A4%B8%E0%A4%B2%E0%A5%8D%E0%A4%AB%E0%A4%BE%E0%A4%87%E0%A4%9F" title="सोडियम सल्फाइट – Hindi" lang="hi" hreflang="hi" data-title="सोडियम सल्फाइट" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Natrium_sulfit" title="Natrium sulfit – Indonesian" lang="id" hreflang="id" data-title="Natrium sulfit" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Solfito_di_sodio" title="Solfito di sodio – Italian" lang="it" hreflang="it" data-title="Solfito di sodio" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%9D%D0%B0%D1%82%D1%80%D0%B8%D0%B9_%D1%81%D1%83%D0%BB%D1%8C%D1%84%D0%B8%D1%82%D0%B8" title="Натрий сульфити – Kyrgyz" lang="ky" hreflang="ky" data-title="Натрий сульфити" data-language-autonym="Кыргызча" data-language-local-name="Kyrgyz" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/N%C4%81trija_sulf%C4%ABts" title="Nātrija sulfīts – Latvian" lang="lv" hreflang="lv" data-title="Nātrija sulfīts" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/N%C3%A1trium-szulfit" title="Nátrium-szulfit – Hungarian" lang="hu" hreflang="hu" data-title="Nátrium-szulfit" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Natriumsulfiet" title="Natriumsulfiet – Dutch" lang="nl" hreflang="nl" data-title="Natriumsulfiet" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E4%BA%9C%E7%A1%AB%E9%85%B8%E3%83%8A%E3%83%88%E3%83%AA%E3%82%A6%E3%83%A0" title="亜硫酸ナトリウム – Japanese" lang="ja" hreflang="ja" data-title="亜硫酸ナトリウム" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Siarczyn_sodu" title="Siarczyn sodu – Polish" lang="pl" hreflang="pl" data-title="Siarczyn sodu" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Sulfito_de_s%C3%B3dio" title="Sulfito de sódio – Portuguese" lang="pt" hreflang="pt" data-title="Sulfito de sódio" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Sulfit_de_sodiu" title="Sulfit de sodiu – Romanian" lang="ro" hreflang="ro" data-title="Sulfit de sodiu" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A1%D1%83%D0%BB%D1%8C%D1%84%D0%B8%D1%82_%D0%BD%D0%B0%D1%82%D1%80%D0%B8%D1%8F" title="Сульфит натрия – Russian" lang="ru" hreflang="ru" data-title="Сульфит натрия" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Sodium_sulfite" title="Sodium sulfite – Simple English" lang="en-simple" hreflang="en-simple" data-title="Sodium sulfite" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Natrijum_sulfit" title="Natrijum sulfit – Serbian" lang="sr" hreflang="sr" data-title="Natrijum sulfit" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Natrijum_sulfit" title="Natrijum sulfit – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Natrijum sulfit" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Natriumsulfiitti" title="Natriumsulfiitti – Finnish" lang="fi" hreflang="fi" data-title="Natriumsulfiitti" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Natriumsulfit" title="Natriumsulfit – Swedish" lang="sv" hreflang="sv" data-title="Natriumsulfit" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B9%82%E0%B8%8B%E0%B9%80%E0%B8%94%E0%B8%B5%E0%B8%A2%E0%B8%A1%E0%B8%8B%E0%B8%B1%E0%B8%A5%E0%B9%84%E0%B8%9F%E0%B8%95%E0%B9%8C" title="โซเดียมซัลไฟต์ – Thai" lang="th" hreflang="th" data-title="โซเดียมซัลไฟต์" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D1%83%D0%BB%D1%8C%D1%84%D1%96%D1%82_%D0%BD%D0%B0%D1%82%D1%80%D1%96%D1%8E" title="Сульфіт натрію – Ukrainian" lang="uk" hreflang="uk" data-title="Сульфіт натрію" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Natri_sulfit" title="Natri sulfit – Vietnamese" lang="vi" hreflang="vi" data-title="Natri sulfit" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E4%BA%9A%E7%A1%AB%E9%85%B8%E9%92%A0" title="亚硫酸钠 – Chinese" lang="zh" hreflang="zh" data-title="亚硫酸钠" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a 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dir="ltr"><style data-mw-deduplicate="TemplateStyles:r1268415487">.mw-parser-output .ib-chembox{border-collapse:collapse;text-align:left}.mw-parser-output .ib-chembox td,.mw-parser-output .ib-chembox th{border:1px solid #a2a9b1;width:40%}.mw-parser-output .ib-chembox td+td{width:60%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .ib-chembox figure:not(.skin-invert-image):not(.skin-invert):not(.bg-transparent){background:var(--background-color-inverted,#f8f9fa)}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .ib-chembox figure:not(.skin-invert-image):not(.skin-invert):not(.bg-transparent){background:var(--background-color-inverted,#f8f9fa)}}</style> <table class="infobox ib-chembox"> <caption>Sodium sulphite </caption> <tbody><tr> <td colspan="2" style="text-align:center; padding:2px;"><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:Na2SO3.svg" class="mw-file-description" title="Sodium sulfite"><img alt="Sodium sulfite" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Na2SO3.svg/220px-Na2SO3.svg.png" decoding="async" width="220" height="114" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Na2SO3.svg/330px-Na2SO3.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c8/Na2SO3.svg/440px-Na2SO3.svg.png 2x" data-file-width="120" data-file-height="62" /></a><figcaption>Sodium sulfite</figcaption></figure> </td></tr> <tr> <td colspan="2" class="borderless" style="text-align:center"> <table border="0" style="width:100%;display:inline-table;"> <tbody><tr> <td style="border-right:1px solid #aaa; width:50%;"><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:Sodium_sulfite.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Sodium_sulfite.jpg/110px-Sodium_sulfite.jpg" decoding="async" width="110" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Sodium_sulfite.jpg/165px-Sodium_sulfite.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Sodium_sulfite.jpg/220px-Sodium_sulfite.jpg 2x" data-file-width="500" data-file-height="667" /></a><figcaption></figcaption></figure><div style="text-align:center">anhydrous</div> </td> <td style="width:50%;"><figure class="mw-halign-center" typeof="mw:File"><a href="/wiki/File:Sodium_sulfite_hydrate.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Sodium_sulfite_hydrate.jpg/110px-Sodium_sulfite_hydrate.jpg" decoding="async" width="110" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Sodium_sulfite_hydrate.jpg/165px-Sodium_sulfite_hydrate.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Sodium_sulfite_hydrate.jpg/220px-Sodium_sulfite_hydrate.jpg 2x" data-file-width="500" data-file-height="667" /></a><figcaption></figcaption></figure><div style="text-align:center">hydrate</div> </td></tr></tbody></table> </td></tr> <tr> <th colspan="2" style="background: #f8eaba;color:inherit; text-align: center;">Names </th></tr> <tr> <td colspan="2" style="text-align:left;"><a href="/wiki/Chemical_nomenclature" title="Chemical nomenclature">IUPAC name</a> <div style="max-width:22em; word-wrap:break-word; padding-left:1.7em;">Sodium sulfite</div> </td></tr> <tr> <td colspan="2" style="text-align:left;">Other names <div style="max-width:22em; word-wrap:break-word; padding-left:1.7em;"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li>Hypo clear (photography)</li><li>E221</li></ul></div></div> </td></tr> <tr> <th colspan="2" style="background: #f8eaba;color:inherit; text-align: center;">Identifiers </th></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/CAS_Registry_Number" title="CAS Registry Number">CAS Number</a></div> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="commonchemistry.cas.org"><a rel="nofollow" class="external text" href="https://commonchemistry.cas.org/detail?cas_rn=7757-83-7">7757-83-7</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png" decoding="async" width="7" height="7" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span></sup></li></ul></div> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">3D model (<a href="/wiki/JSmol" class="mw-redirect" title="JSmol">JSmol</a>)</div> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="chemapps.stolaf.edu (3D interactive model)"><a rel="nofollow" class="external text" href="https://chemapps.stolaf.edu/jmol/jmol.php?model=%5BO-%5DS%28%3DO%29%5BO-%5D.%5BNa%2B%5D.%5BNa%2B%5D">Interactive image</a></span></li></ul></div> </td></tr> <tr> <td><a href="/wiki/ChEBI" title="ChEBI">ChEBI</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="www.ebi.ac.uk"><a rel="nofollow" class="external text" href="https://www.ebi.ac.uk/chebi/searchId.do?chebiId=86477">CHEBI:86477</a></span><sup> <span typeof="mw:File"><span><img alt="☒" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/7px-X_mark.svg.png" decoding="async" width="7" height="8" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/11px-X_mark.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/14px-X_mark.svg.png 2x" data-file-width="525" data-file-height="600" /></span></span><span style="display:none">N</span></sup></li></ul></div> </td></tr> <tr> <td><a href="/wiki/ChemSpider" title="ChemSpider">ChemSpider</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="www.chemspider.com"><a rel="nofollow" class="external text" href="https://www.chemspider.com/Chemical-Structure.22845.html">22845</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png" decoding="async" width="7" height="7" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span></sup></li></ul></div> </td></tr> <tr> <td><a href="/wiki/ECHA_InfoCard" class="mw-redirect" title="ECHA InfoCard"><span title="echa.europa.eu">ECHA InfoCard</span></a> </td> <td><a rel="nofollow" class="external text" href="https://echa.europa.eu/substance-information/-/substanceinfo/100.028.929">100.028.929</a> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q407806#P2566" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span> </td></tr> <tr> <td><a href="/wiki/European_Community_number" title="European Community number"><span title="European Community number (chemical identifier)">EC Number</span></a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li>231-821-4</li></ul></div> </td></tr> <tr> <td><a href="/wiki/E_number" title="E number"><span title="E number (food additive code)">E number</span></a> </td> <td>E221 <a href="/wiki/E_number#E200–E299" title="E number">(preservatives)</a> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/PubChem" title="PubChem">PubChem</a> <abbr title="Compound ID">CID</abbr></div> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="pubchem.ncbi.nlm.nih.gov"><a rel="nofollow" class="external text" href="https://pubchem.ncbi.nlm.nih.gov/compound/24437">24437</a></span></li></ul></div> </td></tr> <tr> <td><a href="/wiki/RTECS" class="mw-redirect" title="RTECS">RTECS number</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li>WE2150000</li></ul></div> </td></tr> <tr> <td><a href="/wiki/Unique_Ingredient_Identifier" title="Unique Ingredient Identifier">UNII</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="precision.fda.gov"><a rel="nofollow" class="external text" href="https://precision.fda.gov/uniisearch/srs/unii/VTK01UQK3G">VTK01UQK3G</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png" decoding="async" width="7" height="7" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span></sup></li></ul></div> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/CompTox_Chemicals_Dashboard" title="CompTox Chemicals Dashboard">CompTox Dashboard</a> <span style="font-weight:normal">(<abbr title="U.S. Environmental Protection Agency">EPA</abbr>)</span></div> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409"><div class="plainlist"><ul><li><span title="comptox.epa.gov"><a rel="nofollow" class="external text" href="https://comptox.epa.gov/dashboard/chemical/details/DTXSID2044260">DTXSID2044260</a> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q407806#P3117" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></span></li></ul></div> </td></tr> <tr> <td colspan="2"><div class="collapsible-list mw-collapsible mw-collapsed" style="text-align: left;"> <div style="line-height: 1.6em; font-weight: bold; text-align:left; font-weight:normal;"><div><a href="/wiki/International_Chemical_Identifier" title="International Chemical Identifier">InChI</a></div></div> <ul class="mw-collapsible-content" style="margin-top: 0; margin-bottom: 0; line-height: inherit; list-style: none; margin-left: 0; word-break:break-all;"><li style="line-height: inherit; margin: 0"><div style="border-top:1px solid #ccc; padding:0.2em 0 0.2em 1.5em; text-align:left;"><div style="word-wrap:break-word; text-indent:-1.5em; font-size:97%; line-height:120%;">InChI=1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2<sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png" decoding="async" width="7" height="7" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span></sup></div><div style="word-wrap:break-word; text-indent:-1.5em; font-size:97%; line-height:120%;">Key: GEHJYWRUCIMESM-UHFFFAOYSA-L<sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png" decoding="async" width="7" height="7" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span></sup></div></div></li><li style="line-height: inherit; margin: 0"><div style="border-top:1px solid #ccc; padding:0.2em 0 0.2em 1.5em; text-align:left;"><div style="word-wrap:break-word; text-indent:-1.5em; font-size:97%; line-height:120%;">InChI=1/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2</div><div style="word-wrap:break-word; text-indent:-1.5em; font-size:97%; line-height:120%;">Key: GEHJYWRUCIMESM-NUQVWONBAK</div></div></li></ul> </div> </td></tr> <tr> <td colspan="2"><div class="collapsible-list mw-collapsible mw-collapsed" style="text-align: left;"> <div style="line-height: 1.6em; font-weight: bold; text-align:left; font-weight:normal;"><div><a href="/wiki/Simplified_molecular-input_line-entry_system" class="mw-redirect" title="Simplified molecular-input line-entry system">SMILES</a></div></div> <ul class="mw-collapsible-content" style="margin-top: 0; margin-bottom: 0; line-height: inherit; list-style: none; margin-left: 0; word-break:break-all;"><li style="line-height: inherit; margin: 0"><div style="border-top:1px solid #ccc; padding:0.2em 0 0.2em 1.6em; word-wrap:break-word; text-indent:-1.5em; text-align:left; font-size:97%; line-height:120%;">[O-]S(=O)[O-].[Na+].[Na+]</div></li></ul> </div> </td></tr> <tr> <th colspan="2" style="background: #f8eaba;color:inherit; text-align: center;">Properties </th></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Chemical_formula" title="Chemical formula">Chemical formula</a></div> </td> <td>Na<sub>2</sub>SO<sub>3</sub>  </td></tr> <tr> <td><a href="/wiki/Molar_mass" title="Molar mass">Molar mass</a> </td> <td>126.043<span class="nowrap"> </span>g/mol    </td></tr> <tr> <td>Appearance </td> <td>White solid </td></tr> <tr> <td><a href="/wiki/Odor" title="Odor">Odor</a> </td> <td>Odorless </td></tr> <tr> <td><a href="/wiki/Density" title="Density">Density</a> </td> <td>2.633<span class="nowrap"> </span>g/cm<sup>3</sup> (anhydrous)<br />1.561<span class="nowrap"> </span>g/cm<sup>3</sup> (heptahydrate) </td></tr> <tr> <td><a href="/wiki/Melting_point" title="Melting point">Melting point</a> </td> <td>33.4 °C (92.1 °F; 306.5 K) (dehydration of heptahydrate)<br /> 500 °C (anhydrous) </td></tr> <tr> <td><a href="/wiki/Boiling_point" title="Boiling point">Boiling point</a> </td> <td>Decomposes </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Aqueous_solution" title="Aqueous solution">Solubility in water</a></div> </td> <td>27.0<span class="nowrap"> </span>g/100<span style="white-space: nowrap;"> </span>mL water (20<span class="nowrap"> </span>°C) </td></tr> <tr> <td><a href="/wiki/Solubility" title="Solubility">Solubility</a> </td> <td>Soluble in <a href="/wiki/Glycerol" title="Glycerol">glycerol</a> <br />Insoluble in <a href="/wiki/Ammonia" title="Ammonia">ammonia</a>, <a href="/wiki/Chlorine" title="Chlorine">chlorine</a> </td></tr> <tr> <td><a href="/wiki/Partition_coefficient" title="Partition coefficient">log <i>P</i></a> </td> <td>−4 </td></tr> <tr> <td><a href="/wiki/Acid_dissociation_constant" title="Acid dissociation constant">Acidity</a> (p<i>K</i><sub>a</sub>) </td> <td>~9 (heptahydrate) </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Refractive_index" title="Refractive index">Refractive index</a> (<i>n</i><sub>D</sub>)</div> </td> <td>1.565 </td></tr> <tr> <th colspan="2" style="background: #f8eaba;color:inherit; text-align: center;">Structure </th></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Crystal_structure" title="Crystal structure">Crystal structure</a></div> </td> <td>Hexagonal (anhydrous)<br />Monoclinic (heptahydrate) </td></tr> <tr> <th colspan="2" style="background: #f8eaba;color:inherit; text-align: center;">Hazards </th></tr> <tr> <td><a href="/wiki/NFPA_704" title="NFPA 704"><b>NFPA 704</b></a> (fire diamond) </td> <td><style data-mw-deduplicate="TemplateStyles:r1170367383">.mw-parser-output .nfpa-704-diamond-ref{float:right;padding:1px;text-align:right}.mw-parser-output .nfpa-704-diamond-container{width:82px;font-family:sans-serif;margin:0 auto}.mw-parser-output .nfpa-704-diamond-container-ref{float:left;margin-left:1em}.mw-parser-output .nfpa-704-diamond-images{float:left;font-size:20px;text-align:center;position:relative;height:80px;width:80px;padding:1px}.mw-parser-output .nfpa-704-diamond-map{position:absolute;height:80px;width:80px}.mw-parser-output .nfpa-704-diamond .noresize{margin:0 auto}.mw-parser-output .nfpa-704-diamond-code{line-height:1em;text-align:center;position:absolute}.mw-parser-output .nfpa-704-diamond-code>a{color:black}.mw-parser-output .nfpa-704-diamond-blue{width:13px;top:31px;left:15px}.mw-parser-output .nfpa-704-diamond-red{width:12px;top:12px;left:35px}.mw-parser-output .nfpa-704-diamond-yellow{width:13px;top:31px;left:54px}.mw-parser-output .nfpa-704-diamond-white-image{position:relative;top:51px;left:0}.mw-parser-output .nfpa-704-diamond-white-text{vertical-align:middle;text-align:center;line-height:80%;position:absolute;top:52px}.mw-parser-output .nfpa-704-diamond-white-text a>span{position:absolute;color:black}.mw-parser-output .nfpa-704-diamond-white-wors{font-size:15px;width:23px;left:29px}.mw-parser-output .nfpa-704-diamond-white-wox{font-size:15px;font-stretch:condensed;width:21px;line-height:80%;top:-4px;left:29px}.mw-parser-output .nfpa-704-diamond-white-abcp{font-size:13.5px;font-stretch:condensed;width:28px;left:26px}.mw-parser-output .nfpa-704-diamond-white-ac{font-size:10px;width:30px;left:25px}.mw-parser-output .nfpa-704-diamond-white-strike{text-decoration:line-through}</style><div class="nfpa-704-diamond notheme"><div class="nfpa-704-diamond-container"><div class="nfpa-704-diamond-images nounderlines"> <div class="nfpa-704-diamond-map"><figure class="noresize" typeof="mw:File"><span><img alt="NFPA 704 four-colored diamond" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/80px-NFPA_704.svg.png" decoding="async" width="80" height="80" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/120px-NFPA_704.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/160px-NFPA_704.svg.png 2x" data-file-width="512" data-file-height="512" usemap="#ImageMap_b27845110d7e52b0" /></span><map name="ImageMap_b27845110d7e52b0"><area href="/wiki/NFPA_704#Blue" shape="poly" coords="23,23,47,47,23,70,0,47" alt="Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform" title="Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform" /><area href="/wiki/NFPA_704#Red" shape="poly" coords="47,0,70,23,47,47,23,23" alt="Flammability 0: Will not burn. E.g. water" title="Flammability 0: Will not burn. E.g. water" /><area href="/wiki/NFPA_704#Yellow" shape="poly" coords="70,23,94,47,70,70,47,47" alt="Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen" title="Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen" /><area href="/wiki/NFPA_704#White" shape="poly" coords="47,47,70,70,47,94,23,70" alt="Special hazards (white): no code" title="Special hazards (white): no code" /></map><figcaption></figcaption></figure></div><div class="nfpa-704-diamond-code nfpa-704-diamond-blue"> <a href="/wiki/NFPA_704#Blue" title="NFPA 704"><span title="Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform" class="notheme mw-no-invert">2</span></a></div><div class="nfpa-704-diamond-code nfpa-704-diamond-red"> <a href="/wiki/NFPA_704#Red" title="NFPA 704"><span title="Flammability 0: Will not burn. E.g. water" class="notheme mw-no-invert">0</span></a></div><div class="nfpa-704-diamond-code nfpa-704-diamond-yellow"> <a href="/wiki/NFPA_704#Yellow" title="NFPA 704"><span title="Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen" class="notheme mw-no-invert">0</span></a></div></div></div></div> </td></tr> <tr> <td><a href="/wiki/Flash_point" title="Flash point">Flash point</a> </td> <td>Non-flammable </td></tr> <tr> <td><a href="/wiki/Safety_data_sheet" title="Safety data sheet">Safety data sheet</a> (SDS) </td> <td><a rel="nofollow" class="external text" href="http://www.inchem.org/documents/icsc/icsc/eics1200.htm">ICSC 1200</a> </td></tr> <tr> <th colspan="2" style="background: #f8eaba;color:inherit; text-align: center;">Related compounds </th></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Other <a href="/wiki/Ion" title="Ion">anions</a></div> </td> <td><a href="/wiki/Sodium_selenite" title="Sodium selenite">Sodium selenite</a> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Other <a href="/wiki/Ion" title="Ion">cations</a></div> </td> <td><a href="/wiki/Potassium_sulfite" title="Potassium sulfite">Potassium sulfite</a> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Related compounds</div> </td> <td><a href="/wiki/Sodium_bisulfite" title="Sodium bisulfite">Sodium bisulfite</a><br /><a href="/wiki/Sodium_metabisulfite" title="Sodium metabisulfite">Sodium metabisulfite</a><br /><a href="/wiki/Sodium_sulfate" title="Sodium sulfate">Sodium sulfate</a> </td></tr> <tr> <td colspan="2" style="text-align:left; background:#f8eaba; color:inherit; border:1px solid #a2a9b1;"><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;">Except where otherwise noted, data are given for materials in their <a href="/wiki/Standard_state" title="Standard state">standard state</a> (at 25 °C [77 °F], 100 kPa).</div> <div style="margin-top: 0.3em;"><div style="text-align:center;"><span typeof="mw:File"><span><img alt="☒" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/12px-X_mark.svg.png" decoding="async" width="12" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/18px-X_mark.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/24px-X_mark.svg.png 2x" data-file-width="525" data-file-height="600" /></span></span><span style="display:none">N</span> <span class="reflink plainlinks nourlexpansion"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Special:ComparePages&rev1=476993033&page2=Sodium+sulfite">verify</a></span> (<a href="/wiki/Wikipedia:WikiProject_Chemicals/Chembox_validation" title="Wikipedia:WikiProject Chemicals/Chembox validation">what is</a> <sup><span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/7px-Yes_check.svg.png" decoding="async" width="7" height="7" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/f/fb/Yes_check.svg/14px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span><span typeof="mw:File"><span><img alt="☒" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/7px-X_mark.svg.png" decoding="async" width="7" height="8" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/11px-X_mark.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a2/X_mark.svg/14px-X_mark.svg.png 2x" data-file-width="525" data-file-height="600" /></span></span><span style="display:none">N</span></sup> ?) </div></div> <div style="margin-top: 0.3em; text-align: center;"><a href="/wiki/Wikipedia:Chemical_infobox#References" title="Wikipedia:Chemical infobox">Infobox references</a></div> </td></tr> </tbody></table><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Chemical compound</div> <p><b>Sodium sulfite</b> (<b>sodium sulphite</b>) is the <a href="/wiki/Inorganic_compound" title="Inorganic compound">inorganic compound</a> with the <a href="/wiki/Chemical_formula" title="Chemical formula">chemical formula</a> <a href="/wiki/Sodium" title="Sodium">Na<sub>2</sub></a><a href="/wiki/Sulfite" title="Sulfite">SO<sub>3</sub></a>. A white, water-soluble solid, it is used commercially as an antioxidant and preservative. It is also suitable for the softening of <a href="/wiki/Lignin" title="Lignin">lignin</a> in the pulping and refining processes of <a href="/wiki/Wood" title="Wood">wood</a> and <a href="/wiki/Lignocellulosic_biomass" title="Lignocellulosic biomass">lignocellulosic materials</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> A heptahydrate is also known but it is less useful because of its greater susceptibility toward oxidation by air.<sup id="cite_ref-IS_2-0" class="reference"><a href="#cite_note-IS-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Preparation">Preparation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sodium_sulfite&action=edit&section=1" title="Edit section: Preparation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Sodium-sulfite-xtal-3x3x3-c-3D-bs-17.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Sodium-sulfite-xtal-3x3x3-c-3D-bs-17.png/220px-Sodium-sulfite-xtal-3x3x3-c-3D-bs-17.png" decoding="async" width="220" height="138" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Sodium-sulfite-xtal-3x3x3-c-3D-bs-17.png/330px-Sodium-sulfite-xtal-3x3x3-c-3D-bs-17.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c1/Sodium-sulfite-xtal-3x3x3-c-3D-bs-17.png/440px-Sodium-sulfite-xtal-3x3x3-c-3D-bs-17.png 2x" data-file-width="3000" data-file-height="1883" /></a><figcaption>Structure of anhydrous sodium sulfite</figcaption></figure> <p>Sodium sulfite can be prepared by treating a solution of <a href="/wiki/Sodium_hydroxide" title="Sodium hydroxide">sodium hydroxide</a> with <a href="/wiki/Sulfur_dioxide" title="Sulfur dioxide">sulfur dioxide</a>. When conducted in warm water, Na<sub>2</sub>SO<sub>3</sub> initially precipitates as a white solid. With more SO<sub>2</sub>, the solid dissolves to give the <a href="/wiki/Na2S2O5" class="mw-redirect" title="Na2S2O5">disulfite</a>, which crystallizes upon cooling.<sup id="cite_ref-IS_2-1" class="reference"><a href="#cite_note-IS-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <dl><dd><style data-mw-deduplicate="TemplateStyles:r1123817410">.mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:left}.mw-parser-output sub.template-chem2-sub{font-size:80%;vertical-align:-0.35em}.mw-parser-output sup.template-chem2-sup{font-size:80%;vertical-align:0.65em}</style><span class="chemf nowrap">SO<sub class="template-chem2-sub">2</sub> + 2 NaOH → Na<sub class="template-chem2-sub">2</sub>SO<sub class="template-chem2-sub">3</sub> + H<sub class="template-chem2-sub">2</sub>O</span></dd></dl> <p>Sodium sulfite is made industrially by treating sulfur dioxide with a solution of sodium carbonate.<sup id="cite_ref-Kirk-Othmer_3-0" class="reference"><a href="#cite_note-Kirk-Othmer-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> The overall reaction is: </p> <dl><dd><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">SO<sub class="template-chem2-sub">2</sub> + Na<sub class="template-chem2-sub">2</sub>CO<sub class="template-chem2-sub">3</sub> → Na<sub class="template-chem2-sub">2</sub>SO<sub class="template-chem2-sub">3</sub> + CO<sub class="template-chem2-sub">2</sub></span></dd></dl> <div class="mw-heading mw-heading2"><h2 id="Uses">Uses</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sodium_sulfite&action=edit&section=2" title="Edit section: Uses"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Sodium sulfite is primarily used in the <a href="/wiki/Pulp_and_paper_industry" title="Pulp and paper industry">pulp and paper industry</a>.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> It has been also applied in the thermomechanical conversion of wood to fibres (<i>defibration</i>) for producing medium density fibreboards (MDF).<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>As an oxygen scavenger agent, it is used to treat water being fed to steam boilers to avoid corrosion problems,<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> in the photographic industry, it protects developer solutions from oxidation and (as hypo clear solution) to wash fixer (<a href="/wiki/Sodium_thiosulfate" title="Sodium thiosulfate">sodium thiosulfate</a>) from film and photo-paper emulsions. </p><p>As a reducing agent it is used in the textile industry as a bleaching, desulfurizing, and dechlorinating agent (e.g. in swimming pools). Its reducing properties are exploited in its use as a <a href="/wiki/Preservative" title="Preservative">preservative</a> to prevent <a href="/wiki/Dried_fruit" title="Dried fruit">dried fruit</a> from discoloring, and for preserving meats. </p><p>It is used as a reagent in sulfonation and sulfomethylation agent. It is used in the production of <a href="/wiki/Sodium_thiosulfate" title="Sodium thiosulfate">sodium thiosulfate</a>. </p><p>The <a href="/wiki/Wellman%E2%80%93Lord_process" title="Wellman–Lord process">Wellman–Lord process</a> utilizes sodium sulfite for <a href="/wiki/Flue_gas_desulfurization" class="mw-redirect" title="Flue gas desulfurization">flue gas desulfurization</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Reactions">Reactions</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sodium_sulfite&action=edit&section=3" title="Edit section: Reactions"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Sulfite" title="Sulfite">sulfite</a></div> <p>Sodium sulfite is primarily used as a mild reducing agent. The heptahydrate crystals <a href="/wiki/Efflorescence" title="Efflorescence">effloresce</a> in warm dry air. Heptahydrate crystals also oxidize in air to form sodium sulfate. The anhydrous form is more resistant to oxidation by air.<sup id="cite_ref-merck_7-0" class="reference"><a href="#cite_note-merck-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Sodium_bisulfite" title="Sodium bisulfite">Sodium bisulfite</a>, NaHSO<sub>3</sub>, is mixture of salts that dissolve in water to give solutions composed of sodium and bisulfite ions. </p> <div class="mw-heading mw-heading2"><h2 id="Structure">Structure</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sodium_sulfite&action=edit&section=4" title="Edit section: Structure"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>According to <a href="/wiki/X-ray_crystallography" title="X-ray crystallography">X-ray crystallography</a> sodium sulfite heptahydrate features pyramidal SO<sub>3</sub><sup>2-</sup> centers. The S-O distances are 1.50 and the O-S-O angles are near 106º.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Sodium_sulfite&action=edit&section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://ippta.co/wp-content/uploads/2021/01/IPPTA-VII1-39-42-High-Yield-Pulp-Production.pdf">"High Yield Pulp Production by Modified Sulfite Process"</a> <span class="cs1-format">(PDF)</span><span class="reference-accessdate">. Retrieved <span class="nowrap">2023-10-19</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=High+Yield+Pulp+Production+by+Modified+Sulfite+Process&rft_id=https%3A%2F%2Fippta.co%2Fwp-content%2Fuploads%2F2021%2F01%2FIPPTA-VII1-39-42-High-Yield-Pulp-Production.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASodium+sulfite" class="Z3988"></span></span> </li> <li id="cite_note-IS-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-IS_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-IS_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFJohnstone1946" class="citation book cs1">Johnstone, H. F. (1946). "Sulfites and Pyrosulfites of the Alkali Metals". <i>Inorganic Syntheses</i>. Vol. 2. pp. <span class="nowrap">162–</span>167. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2F9780470132333.ch49">10.1002/9780470132333.ch49</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/9780470132333" title="Special:BookSources/9780470132333"><bdi>9780470132333</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Sulfites+and+Pyrosulfites+of+the+Alkali+Metals&rft.btitle=Inorganic+Syntheses&rft.pages=%3Cspan+class%3D%22nowrap%22%3E162-%3C%2Fspan%3E167&rft.date=1946&rft_id=info%3Adoi%2F10.1002%2F9780470132333.ch49&rft.isbn=9780470132333&rft.aulast=Johnstone&rft.aufirst=H.+F.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASodium+sulfite" class="Z3988"></span></span> </li> <li id="cite_note-Kirk-Othmer-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-Kirk-Othmer_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWeilSandler1999" class="citation book cs1">Weil, Edward D.; Sandler, Stanley R. (1999). "Sulfur Compounds". In Kroschwitz, Jacqueline I. (ed.). <i>Kirk-Othmer Concise Encyclopedia of Chemical Technology</i> (4th ed.). New York: John Wiley & Sons, Inc. p. 1937. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0471419617" title="Special:BookSources/978-0471419617"><bdi>978-0471419617</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Sulfur+Compounds&rft.btitle=Kirk-Othmer+Concise+Encyclopedia+of+Chemical+Technology&rft.place=New+York&rft.pages=1937&rft.edition=4th&rft.pub=John+Wiley+%26+Sons%2C+Inc.&rft.date=1999&rft.isbn=978-0471419617&rft.aulast=Weil&rft.aufirst=Edward+D.&rft.au=Sandler%2C+Stanley+R.&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASodium+sulfite" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFBarberáMetzgerWolf2000" class="citation encyclopaedia cs1">Barberá, José Jiménez; Metzger, Adolf; Wolf, Manfred (2000). "Sulfites, Thiosulfates, and Dithionitesl Chemistry". <i><a href="/wiki/Ullmann%27s_Encyclopedia_of_Industrial_Chemistry" title="Ullmann's Encyclopedia of Industrial Chemistry">Ullmann's Encyclopedia of Industrial Chemistry</a></i>. Weinheim: Wiley-VCH. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1002%2F14356007.a25_477">10.1002/14356007.a25_477</a>. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/3527306730" title="Special:BookSources/3527306730"><bdi>3527306730</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Sulfites%2C+Thiosulfates%2C+and+Dithionitesl+Chemistry&rft.btitle=Ullmann%27s+Encyclopedia+of+Industrial+Chemistry&rft.place=Weinheim&rft.pub=Wiley-VCH&rft.date=2000&rft_id=info%3Adoi%2F10.1002%2F14356007.a25_477&rft.isbn=3527306730&rft.aulast=Barber%C3%A1&rft.aufirst=Jos%C3%A9+Jim%C3%A9nez&rft.au=Metzger%2C+Adolf&rft.au=Wolf%2C+Manfred&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASodium+sulfite" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://patents.google.com/patent/DE19958756A1/en">"DE19958756A1 - Production of light-colored medium-density fibreboard (MDF) from old fibreboard comprises treatment with sodium sulfite, conversion into pulp and feeding into the blow-line of an MDF plant"</a>. <i>Google Patents</i>. 1999-12-07<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-03-01</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Google+Patents&rft.atitle=DE19958756A1+-+Production+of+light-colored+medium-density+fibreboard+%28MDF%29+from+old+fibreboard+comprises+treatment+with+sodium+sulfite%2C+conversion+into+pulp+and+feeding+into+the+blow-line+of+an+MDF+plant&rft.date=1999-12-07&rft_id=https%3A%2F%2Fpatents.google.com%2Fpatent%2FDE19958756A1%2Fen&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASodium+sulfite" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20171006062229/https://www.gewater.com/handbook/boiler_water_systems/ch_11_preboiler.jsp">"Pre-boiler and Boiler Corrosion Control | GE Water"</a>. Archived from <a rel="nofollow" class="external text" href="http://www.gewater.com/handbook/boiler_water_systems/ch_11_preboiler.jsp">the original</a> on 2017-10-06<span class="reference-accessdate">. Retrieved <span class="nowrap">2016-03-14</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Pre-boiler+and+Boiler+Corrosion+Control+%26%23124%3B+GE+Water&rft_id=http%3A%2F%2Fwww.gewater.com%2Fhandbook%2Fboiler_water_systems%2Fch_11_preboiler.jsp&rfr_id=info%3Asid%2Fen.wikipedia.org%3ASodium+sulfite" class="Z3988"></span></span> </li> <li id="cite_note-merck-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-merck_7-0">^</a></b></span> <span class="reference-text">Merck Index of Chemicals and Drugs, 9th ed. monograph 8451</span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFLarssonKierkegaardLindbergHolme1969" class="citation journal cs1">Larsson, Lars Olof; Kierkegaard, Peder; Lindberg, Bengt; Holme, Tord; Lindberg, Alf A.; Craig, J. Cymerman (1969). <a rel="nofollow" class="external text" href="https://doi.org/10.3891%2Facta.chem.scand.23-2253">"The Crystal Structure of Sodium Sulphite. A Refinement Allowing for the Effect of Crystal Twinning"</a>. <i>Acta Chemica Scandinavica</i>. <b>23</b>: <span class="nowrap">2253–</span>2260. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.3891%2Facta.chem.scand.23-2253">10.3891/acta.chem.scand.23-2253</a></span>.</cite><span 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href="/wiki/Template:Sodium_compounds" title="Template:Sodium compounds"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Sodium_compounds" title="Template talk:Sodium compounds"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Sodium_compounds" title="Special:EditPage/Template:Sodium compounds"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Sodium_compounds53" style="font-size:114%;margin:0 4em"><a href="/wiki/Sodium_compounds" title="Sodium compounds">Sodium compounds</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Inorganic</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Halides</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sodium_fluoride" title="Sodium fluoride">NaF</a></li> <li><a href="/wiki/Sodium_bifluoride" title="Sodium bifluoride">NaHF<sub>2</sub></a></li> <li><a href="/wiki/Sodium_chloride" title="Sodium chloride">NaCl</a></li> <li><a href="/wiki/Sodium_bromide" title="Sodium bromide">NaBr</a></li> <li><a href="/wiki/Sodium_iodide" title="Sodium iodide">NaI</a></li> <li><a href="/wiki/Sodium_astatide" title="Sodium astatide">NaAt</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Chalcogenides</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sodium_ozonide" title="Sodium ozonide">NaO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_superoxide" title="Sodium superoxide">NaO<sub>2</sub></a></li> <li><a href="/wiki/Sodium_oxide" title="Sodium oxide">Na<sub>2</sub>O</a></li> <li><a href="/wiki/Sodium_peroxide" title="Sodium peroxide">Na<sub>2</sub>O<sub>2</sub></a></li> <li><a href="/wiki/Sodium_hydroxide" title="Sodium hydroxide">NaOH</a></li> <li><a href="/wiki/Sodium_deuteroxide" title="Sodium deuteroxide">NaOD</a></li> <li><a href="/wiki/Sodium_sulfide" title="Sodium sulfide">Na<sub>2</sub>S</a></li> <li><a href="/wiki/Sodium_hydrosulfide" title="Sodium hydrosulfide">NaSH</a></li> <li><a href="/wiki/Sodium_selenide" title="Sodium selenide">Na<sub>2</sub>Se</a></li> <li><a href="/wiki/Sodium_hydroselenide" title="Sodium hydroselenide">NaSeH</a></li> <li><a href="/wiki/Sodium_telluride" title="Sodium telluride">Na<sub>2</sub>Te</a></li> <li><a href="/w/index.php?title=Sodium_hydrogen_telluride&action=edit&redlink=1" class="new" title="Sodium hydrogen telluride (page does not exist)">NaHTe</a></li> <li><a href="/wiki/Sodium_polonide" title="Sodium polonide">Na<sub>2</sub>Po</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Pnictogenides</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sodium_nitride" title="Sodium nitride">Na<sub>3</sub>N</a></li> <li><a href="/wiki/Sodium_azide" title="Sodium azide">NaN<sub>3</sub></a></li> <li><a href="/wiki/Sodium_amide" title="Sodium amide">NaNH<sub>2</sub></a></li> <li><a href="/wiki/Sodium_phosphide" title="Sodium phosphide">Na<sub>3</sub>P</a></li> <li><a href="/wiki/Sodium_arsenide" title="Sodium arsenide">Na<sub>3</sub>As</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Oxyhalides</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sodium_hypochlorite" title="Sodium hypochlorite">NaClO</a></li> <li><a href="/wiki/Sodium_chlorite" title="Sodium chlorite">NaClO<sub>2</sub></a></li> <li><a href="/wiki/Sodium_chlorate" title="Sodium chlorate">NaClO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_perchlorate" title="Sodium perchlorate">NaClO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_hypobromite" title="Sodium hypobromite">NaBrO</a></li> <li><a href="/wiki/Sodium_bromite" title="Sodium bromite">NaBrO<sub>2</sub></a></li> <li><a href="/wiki/Sodium_bromate" title="Sodium bromate">NaBrO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_perbromate" title="Sodium perbromate">NaBrO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_hypoiodite" title="Sodium hypoiodite">NaIO</a></li> <li><a href="/wiki/Sodium_iodate" title="Sodium iodate">NaIO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_periodate" title="Sodium periodate">NaIO<sub>4</sub></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Oxychalcogenides</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Na<sub>2</sub>SO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_sulfate" title="Sodium sulfate">Na<sub>2</sub>SO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_bisulfite" title="Sodium bisulfite">NaHSO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_bisulfate" title="Sodium bisulfate">NaHSO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_thiosulfate" title="Sodium thiosulfate">Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub></a></li> <li><a href="/wiki/Sodium_dithionite" title="Sodium dithionite">Na<sub>2</sub>S<sub>2</sub>O<sub>4</sub></a></li> <li><a href="/wiki/Sodium_metabisulfite" title="Sodium metabisulfite">Na<sub>2</sub>S<sub>2</sub>O<sub>5</sub></a></li> <li><a href="/wiki/Sodium_dithionate" title="Sodium dithionate">Na<sub>2</sub>S<sub>2</sub>O<sub>6</sub></a></li> <li><a href="/wiki/Sodium_pyrosulfate" title="Sodium pyrosulfate">Na<sub>2</sub>S<sub>2</sub>O<sub>7</sub></a></li> <li><a href="/wiki/Sodium_persulfate" title="Sodium persulfate">Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub></a></li> <li><a href="/wiki/Sodium_selenite" title="Sodium selenite">Na<sub>2</sub>SeO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_selenate" title="Sodium selenate">Na<sub>2</sub>SeO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_biselenite" class="mw-redirect" title="Sodium biselenite">NaHSeO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_tellurite" title="Sodium tellurite">Na<sub>2</sub>TeO<sub>3</sub></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Oxypnictogenides</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sodium_nitrite" title="Sodium nitrite">NaNO<sub>2</sub></a></li> <li><a href="/wiki/Sodium_nitrate" title="Sodium nitrate">NaNO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_hyponitrite" title="Sodium hyponitrite">Na<sub>2</sub>N<sub>2</sub>O<sub>2</sub></a></li> <li><a href="/wiki/Monosodium_phosphate" title="Monosodium phosphate">NaH<sub>2</sub>PO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_hypophosphite" title="Sodium hypophosphite">NaPO<sub>2</sub>H<sub>2</sub></a></li> <li><a href="/wiki/Disodium_hydrogen_phosphite" title="Disodium hydrogen phosphite">Na<sub>2</sub>HPO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_fluorophosphate" class="mw-redirect" title="Sodium fluorophosphate">Na<sub>2</sub>PO<sub>3</sub>F</a></li> <li><a href="/wiki/Sodium_dithiophosphate" title="Sodium dithiophosphate">Na<sub>3</sub>PS<sub>2</sub>O<sub>2</sub></a></li> <li><a href="/wiki/Trisodium_phosphate" title="Trisodium phosphate">Na<sub>3</sub>PO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_triphosphate" title="Sodium triphosphate">Na<sub>5</sub>P<sub>3</sub>O<sub>10</sub></a></li> <li><a href="/wiki/Tetrasodium_pyrophosphate" title="Tetrasodium pyrophosphate">Na<sub>4</sub>P<sub>2</sub>O<sub>7</sub></a></li> <li><a href="/wiki/Disodium_pyrophosphate" title="Disodium pyrophosphate">Na<sub>2</sub>H<sub>2</sub>P<sub>2</sub>O<sub>7</sub></a></li> <li><a href="/wiki/Sodium_arsenite" title="Sodium arsenite">Na<sub>3</sub>AsO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_arsenate" title="Sodium arsenate">Na<sub>3</sub>AsO<sub>4</sub></a></li> <li><a href="/wiki/Disodium_hydrogen_arsenate" title="Disodium hydrogen arsenate">Na<sub>2</sub>HAsO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_dihydrogen_arsenate" title="Sodium dihydrogen arsenate">NaH<sub>2</sub>AsO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_antimonate" class="mw-redirect" title="Sodium antimonate">NaSbO<sub>3</sub></a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Others</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sodium_aluminium_hydride" title="Sodium aluminium hydride">NaAlH<sub>4</sub></a></li> <li><a href="/wiki/Sodium_aluminate" title="Sodium aluminate">NaAlO<sub>2</sub></a></li> <li><a href="/wiki/Sodium_hexafluoroaluminate" title="Sodium hexafluoroaluminate">Na<sub>3</sub>AlF<sub>6</sub></a></li> <li><a href="/wiki/Sodium_alum" title="Sodium alum">NaAl(SO<sub>4</sub>)<sub>2</sub></a></li> <li><a href="/wiki/Sodium_tetrachloroaurate" title="Sodium tetrachloroaurate">NaAuCl<sub>4</sub></a></li> <li><a href="/wiki/Sodium_hexafluoroantimonate" title="Sodium hexafluoroantimonate"><span class="chemf nowrap">NaSbF<sub class="template-chem2-sub">6</sub></span></a></li> <li><a href="/wiki/Sodium_hexafluoroarsenate" title="Sodium hexafluoroarsenate"><span class="chemf nowrap">NaAsF<sub class="template-chem2-sub">6</sub></span></a></li> <li><a href="/wiki/Sodium_hexafluorotitanate" title="Sodium hexafluorotitanate"><span class="chemf nowrap">Na<sub class="template-chem2-sub">2</sub>TiF<sub class="template-chem2-sub">6</sub></span></a></li> <li><a href="/wiki/Sodium_borohydride" title="Sodium borohydride">NaBH<sub>4</sub></a></li> <li><a href="/wiki/Sodium_cyanoborohydride" title="Sodium cyanoborohydride">NaBH<sub>3</sub>(CN)</a></li> <li><a href="/wiki/Sodium_metaborate" title="Sodium metaborate">NaBO<sub>2</sub></a></li> <li><a href="/wiki/Borax" title="Borax">Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub></a></li> <li><a href="/wiki/Disodium_enneaborate" title="Disodium enneaborate">Na<sub>2</sub>B<sub>2</sub>O<sub>9</sub></a></li> <li><a href="/wiki/Disodium_octaborate" title="Disodium octaborate">Na<sub>2</sub>B<sub>8</sub>O<sub>13</sub></a></li> <li><a href="/wiki/Sodium_bismuthate" title="Sodium bismuthate">NaBiO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_cyanide" title="Sodium cyanide">NaCN</a></li> <li><a href="/w/index.php?title=Sodium_fulminate&action=edit&redlink=1" class="new" title="Sodium fulminate (page does not exist)">NaCNO</a></li> <li><a href="/wiki/Sodium_cobalt_oxide" title="Sodium cobalt oxide">NaCoO<sub>2</sub></a></li> <li><a href="/wiki/Sodium_hydride" title="Sodium hydride">NaH</a></li> <li><a href="/wiki/Sodium_bicarbonate" title="Sodium bicarbonate">NaHCO<sub>3</sub></a></li> <li><a href="/w/index.php?title=Sodium_perxenate&action=edit&redlink=1" class="new" title="Sodium perxenate (page does not exist)">Na<sub>4</sub>XeO<sub>6</sub></a></li> <li><a href="/wiki/Monosodium_xenate" title="Monosodium xenate">NaHXeO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_permanganate" title="Sodium permanganate">NaMnO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_cyanate" title="Sodium cyanate">NaOCN</a></li> <li><a href="/wiki/Sodium_perrhenate" title="Sodium perrhenate">NaReO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_thiocyanate" title="Sodium thiocyanate">NaSCN</a></li> <li><a href="/wiki/Sodium_metatechnetate" class="mw-redirect" title="Sodium metatechnetate">NaTcO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_pertechnetate" title="Sodium pertechnetate">NaTcO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_metavanadate" title="Sodium metavanadate">NaVO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_carbonate" title="Sodium carbonate">Na<sub>2</sub>CO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_oxalate" title="Sodium oxalate">Na<sub>2</sub>C<sub>2</sub>O<sub>4</sub></a></li> <li><a href="/wiki/Sodium_1,3-dithiole-2-thione-4,5-dithiolate" title="Sodium 1,3-dithiole-2-thione-4,5-dithiolate">Na<sub>2</sub>C<sub>3</sub>S<sub>5</sub></a></li> <li><a href="/wiki/Sodium_chromate" title="Sodium chromate">Na<sub>2</sub>CrO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_dichromate" title="Sodium dichromate">Na<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub></a></li> <li><a href="/w/index.php?title=Sodium_trichromate&action=edit&redlink=1" class="new" title="Sodium trichromate (page does not exist)">Na<sub>2</sub>Cr<sub>3</sub>O<sub>10</sub></a></li> <li><a href="/wiki/Sodium_germanate" title="Sodium germanate">Na<sub>2</sub>GeO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_helide" class="mw-redirect" title="Sodium helide">Na<sub>2</sub>He</a></li> <li><a href="/wiki/Disodium_tetracarbonylferrate" title="Disodium tetracarbonylferrate">Na<sub>2</sub>[Fe(CO)<sub>4</sub>]</a></li> <li><a href="/wiki/Sodium_manganate" title="Sodium manganate">Na<sub>2</sub>MnO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_molybdate" title="Sodium molybdate">Na<sub>2</sub>MoO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_hexachloroiridate(III)" title="Sodium hexachloroiridate(III)">Na<sub>3</sub>IrCl<sub>6</sub></a></li> <li><a href="/wiki/Sodium_hexachloroplatinate" title="Sodium hexachloroplatinate">Na<sub>2</sub>PtCl<sub>6</sub></a></li> <li><a href="/wiki/Sodium_uranate" class="mw-redirect" title="Sodium uranate">Na<sub>2</sub>O(UO<sub>3</sub>)<sub>2</sub></a></li> <li><a href="/wiki/Sodium_tetrathionate" title="Sodium tetrathionate">Na<sub>2</sub>S<sub>4</sub>O<sub>6</sub></a></li> <li><a href="/wiki/Sodium_silicate" title="Sodium silicate">Na<sub>2</sub>SiO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_metatitanate" title="Sodium metatitanate">Na<sub>2</sub>TiO<sub>3</sub></a></li> <li><a href="/wiki/Sodium_diuranate" title="Sodium diuranate">Na<sub>2</sub>U<sub>2</sub>O<sub>7</sub></a></li> <li><a href="/wiki/Sodium_tungstate" title="Sodium tungstate">Na<sub>2</sub>WO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_zincate" title="Sodium zincate">Na<sub>2</sub>Zn(OH)<sub>4</sub></a></li> <li><a href="/wiki/Sodium_orthovanadate" title="Sodium orthovanadate">Na<sub>3</sub>VO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_decavanadate" title="Sodium decavanadate">Na<sub>6</sub>V<sub>10</sub>O<sub>28</sub></a></li> <li><a href="/wiki/Sodium_ferrocyanide" title="Sodium ferrocyanide">Na<sub>4</sub>Fe(CN)<sub>6</sub></a></li> <li><a href="/w/index.php?title=Sodium_ferricyanide&action=edit&redlink=1" class="new" title="Sodium ferricyanide (page does not exist)">Na<sub>3</sub>Fe(CN)<sub>6</sub></a></li> <li><a href="/wiki/Sodium_ferrioxalate" title="Sodium ferrioxalate">Na<sub>3</sub>Fe(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub></a></li> <li><a href="/wiki/Sodium_orthosilicate" title="Sodium orthosilicate">Na<sub>4</sub>SiO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_fluorosilicate" title="Sodium fluorosilicate">Na<sub>2</sub>SiF<sub>6</sub></a></li> <li><a href="/wiki/Sodium_hexanitritocobaltate(III)" title="Sodium hexanitritocobaltate(III)">Na<sub>3</sub>[Co(NO<sub>2</sub>)<sub>6</sub>]</a></li> <li><a href="/wiki/Sodium_bis(trimethylsilyl)amide" title="Sodium bis(trimethylsilyl)amide">NaNSi<sub>2</sub>(CH<sub>3</sub>)<sub>6</sub></a></li> <li><a href="/wiki/Sodium_tetrachloropalladate" title="Sodium tetrachloropalladate">Na<sub>2</sub>PdCl<sub>4</sub></a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Organosodium" class="mw-redirect" title="Organosodium">Organic</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sodium_methoxide" title="Sodium methoxide">CH<sub>3</sub>ONa</a></li> <li><a href="/wiki/Sodium_ethoxide" title="Sodium ethoxide">C<sub>2</sub>H<sub>5</sub>ONa</a></li> <li><a href="/wiki/Sodium_formate" title="Sodium formate">HCOONa</a></li> <li><a href="/wiki/Sodium_propionate" title="Sodium propionate">C<sub>2</sub>H<sub>5</sub>COONa</a></li> <li><a href="/wiki/Sodium_butyrate" title="Sodium butyrate">C<sub>3</sub>H<sub>7</sub>COONa</a></li> <li><a href="/wiki/Sodium_tartrate" title="Sodium tartrate">Na<sub>2</sub>C<sub>4</sub>H<sub>4</sub>O<sub>6</sub></a></li> <li><a href="/wiki/Sodium_bitartrate" class="mw-redirect" title="Sodium bitartrate">C<sub>4</sub>H<sub>5</sub>NaO<sub>6</sub></a></li> <li><a href="/wiki/Sodium_acetate" title="Sodium acetate">NaCH<sub>3</sub>COO</a></li> <li><a href="/wiki/Sodium_benzoate" title="Sodium benzoate">NaC<sub>6</sub>H<sub>5</sub>CO<sub>2</sub></a></li> <li><a href="/wiki/Sodium_salicylate" title="Sodium salicylate">NaC<sub>6</sub>H<sub>4</sub>(OH)CO<sub>2</sub></a></li> <li><a href="/wiki/Sodium_laurate" title="Sodium laurate">NaC<sub>12</sub>H<sub>23</sub>O<sub>2</sub></a></li> <li><a href="/wiki/Sodium_naphthalene" title="Sodium naphthalene">NaC<sub>10</sub>H<sub>8</sub></a></li> <li><a href="/wiki/Sodium_nitroprusside" title="Sodium nitroprusside">Na<sub>2</sub>[Fe[CN<sub>5</sub>]NO]</a></li> <li><a href="/wiki/Sodium_bis(2-methoxyethoxy)aluminium_hydride" title="Sodium bis(2-methoxyethoxy)aluminium hydride">C<sub>6</sub>H<sub>16</sub>AlNaO<sub>4</sub></a></li> <li><a href="/wiki/Sodium_erythorbate" title="Sodium erythorbate">NaC<sub>6</sub>H<sub>7</sub>O<sub>6</sub></a></li> <li><a href="/wiki/Monosodium_Glutamate" class="mw-redirect" title="Monosodium Glutamate">C<sub>5</sub>H<sub>8</sub>NO<sub>4</sub>Na</a></li> <li><a href="/wiki/Phenylsodium" title="Phenylsodium">C<sub>6</sub>H<sub>5</sub>Na</a></li> <li><a href="/wiki/N-Butylsodium" title="N-Butylsodium">C<sub>4</sub>H<sub>9</sub>Na</a></li> <li><a href="/wiki/Sodium_cyclopentadienide" title="Sodium cyclopentadienide">NaC<sub>5</sub>H<sub>5</sub></a></li> <li><a href="/w/index.php?title=Sodium_Palmitate&action=edit&redlink=1" class="new" title="Sodium Palmitate (page does not exist)">C<sub>15</sub>H<sub>31</sub>COONa</a></li> <li><a href="/w/index.php?title=Sodium_Oleate&action=edit&redlink=1" class="new" title="Sodium Oleate (page does not exist)">C<sub>17</sub>H<sub>33</sub>COONa</a></li> <li><a href="/wiki/Sodium_stearate" title="Sodium stearate">C<sub>18</sub>H<sub>35</sub>O<sub>2</sub>Na</a></li> <li><a href="/wiki/Maitotoxin" title="Maitotoxin">C<sub>164</sub>H<sub>256</sub>O<sub>68</sub>S<sub>2</sub>Na<sub>2</sub></a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"><style data-mw-deduplicate="TemplateStyles:r886047488">.mw-parser-output .nobold{font-weight:normal}</style><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"></div><div role="navigation" class="navbox" aria-labelledby="Compounds_containing_the_sulfite_group_(SO2−3)344" style="display:table;;padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit;table-layout:fixed;"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Sulfites" title="Template:Sulfites"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Sulfites" title="Template talk:Sulfites"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Sulfites" title="Special:EditPage/Template:Sulfites"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Compounds_containing_the_sulfite_group_(SO2−3)344" style="font-size:114%;margin:0 4em">Compounds containing the <a href="/wiki/Sulfite" title="Sulfite">sulfite</a> group (<span class="nobold"><span class="chemf nowrap">SO<span class="template-chem2-su"><span>2−</span><span>3</span></span></span></span>)</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0;border-width:0;"><div style="padding:0"><div class="mw-collapsible-content" style="overflow-x:auto"> <table class="center"> <tbody><tr style="background-color:mistyrose"> <td><a href="/wiki/Sulfurous_acid" title="Sulfurous acid"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">H<sub class="template-chem2-sub">2</sub>SO<sub class="template-chem2-sub">3</sub></span></a> </td> <td style="background-color:white;color:inherit;border:none"> </td> <td style="background-color:white;color:inherit;border:none" colspan="11" rowspan="3"> </td> <td style="background-color:white;color:inherit;border:none" colspan="5"> </td> <td>He </td></tr> <tr style="background-color:mistyrose;color:black;"> <td><a href="/wiki/Lithium_sulfite" title="Lithium sulfite"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">Li<sub class="template-chem2-sub">2</sub>SO<sub class="template-chem2-sub">3</sub></span></a> </td> <td>Be </td> <td>B </td> <td>C </td> <td><a href="/wiki/Ammonium_sulfite" title="Ammonium sulfite"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">(NH<sub class="template-chem2-sub">4</sub>)<sub class="template-chem2-sub">2</sub>SO<sub class="template-chem2-sub">3</sub></span></a><br /><a href="/wiki/Amidosulfite" title="Amidosulfite"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">NSO<span class="template-chem2-su"><span>−</span><span>2</span></span></span></a> </td> <td>O </td> <td><a href="/wiki/Fluorosulfite" title="Fluorosulfite"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">SO<sub class="template-chem2-sub">2</sub>F<sup class="template-chem2-sup">−</sup></span></a> </td> <td>Ne </td></tr> <tr style="background-color:mistyrose;color:black;"> <td><a class="mw-selflink selflink"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">Na<sub class="template-chem2-sub">2</sub>SO<sub class="template-chem2-sub">3</sub></span></a> </td> <td><a href="/wiki/Magnesium_sulfite" title="Magnesium sulfite"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">MgSO<sub class="template-chem2-sub">3</sub>·x(H<sub class="template-chem2-sub">2</sub>O)</span></a> </td> <td>Al </td> <td>Si </td> <td>P </td> <td><a href="/wiki/Sulfite_sulfate" title="Sulfite sulfate">+<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">SO<sub class="template-chem2-sub">4</sub></span></a> </td> <td><a href="/wiki/Chloride_sulfite" title="Chloride sulfite">+<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">Cl</span></a> </td> <td>Ar </td></tr> <tr style="background-color:mistyrose;color:black;"> <td><a href="/wiki/Potassium_sulfite" title="Potassium sulfite"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">K<sub class="template-chem2-sub">2</sub>SO<sub class="template-chem2-sub">3</sub></span></a> </td> <td><a href="/wiki/Calcium_sulfite" title="Calcium sulfite"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">CaSO<sub class="template-chem2-sub">3</sub>·x(H<sub class="template-chem2-sub">2</sub>O)</span></a> </td> <td style="background-color:white;color:inherit;border:none"> </td> <td>Sc </td> <td>Ti </td> <td>V </td> <td>Cr </td> <td>Mn </td> <td>Fe </td> <td>Co </td> <td>Ni </td> <td><a href="/wiki/Chevreul%27s_salt" title="Chevreul's salt"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">CuSO<sub class="template-chem2-sub">3</sub>·Cu<sub class="template-chem2-sub">2</sub>SO<sub class="template-chem2-sub">3</sub>·x(H<sub class="template-chem2-sub">2</sub>O)</span></a> </td> <td>Zn </td> <td>Ga </td> <td>Ge </td> <td>As </td> <td>Se </td> <td>Br </td> <td>Kr </td></tr> <tr style="background-color:mistyrose;color:black;"> <td>Rb </td> <td>Sr </td> <td style="background-color:white;color:inherit;border:none"> </td> <td>Y </td> <td>Zr </td> <td>Nb </td> <td>Mo </td> <td>Tc </td> <td>Ru </td> <td>Rh </td> <td>Pd </td> <td><a href="/wiki/Silver_sulfite" title="Silver sulfite"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">Ag<sub class="template-chem2-sub">2</sub>SO<sub class="template-chem2-sub">3</sub></span></a> </td> <td>Cd </td> <td>In </td> <td>Sn </td> <td>Sb </td> <td>Te </td> <td>I </td> <td>Xe </td></tr> <tr style="background-color:mistyrose;color:black;"> <td>Cs </td> <td><a href="/wiki/Barium_sulfite" title="Barium sulfite"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1123817410"><span class="chemf nowrap">BaSO<sub class="template-chem2-sub">3</sub></span></a> </td> <td style="background-color:white;color:inherit;border:none">* </td> <td>Lu </td> <td>Hf </td> <td>Ta </td> <td>W </td> <td>Re </td> <td>Os </td> <td>Ir </td> <td>Pt </td> <td>Au </td> <td>Hg </td> <td>Tl </td> <td>Pb </td> <td>Bi </td> <td>Po </td> <td>At </td> <td>Rn </td></tr> <tr style="background-color:mistyrose;color:black;"> <td>Fr </td> <td>Ra </td> <td style="background-color:white;color:inherit;border:none">** </td> <td>Lr </td> <td>Rf </td> <td>Db </td> <td>Sg </td> <td>Bh </td> <td>Hs </td> <td>Mt </td> <td>Ds </td> <td>Rg </td> <td>Cn </td> <td>Nh </td> <td>Fl </td> <td>Mc </td> <td>Lv </td> <td>Ts </td> <td>Og </td></tr> <tr> <td style="background-color:white;color:inherit;border:none" colspan="2" rowspan="3"> </td> <td style="background-color:white;color:inherit;border:none" colspan="20">  </td></tr> <tr style="background-color:mistyrose;color:black;"> <td style="background-color:white;color:inherit;border:none">* </td> <td>La </td> <td>Ce </td> <td>Pr </td> <td>Nd </td> <td>Pm </td> <td>Sm </td> <td>Eu </td> <td>Gd </td> <td>Tb </td> <td>Dy </td> <td>Ho </td> 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