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Available in 25 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-25" 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">25 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AD%D9%85%D8%B6_%D8%A7%D9%84%D8%B3%D9%8A%D9%84%D9%8A%D9%86%D9%88%D8%B2" title="حمض السيلينوز – Arabic" lang="ar" hreflang="ar" data-title="حمض السيلينوز" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-azb mw-list-item"><a href="https://azb.wikipedia.org/wiki/%D8%B3%D9%84%D9%86%D9%88%D8%B3_%D8%A7%D8%B3%DB%8C%D8%AF" title="سلنوس اسید – South Azerbaijani" lang="azb" hreflang="azb" data-title="سلنوس اسید" data-language-autonym="تۆرکجه" data-language-local-name="South Azerbaijani" class="interlanguage-link-target"><span>تۆرکجه</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/%C3%80cid_selen%C3%B3s" title="Àcid selenós – Catalan" lang="ca" hreflang="ca" data-title="Àcid selenós" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Selenige_S%C3%A4ure" title="Selenige Säure – German" lang="de" hreflang="de" data-title="Selenige Säure" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Selenous_acid" title="Selenous acid – English" lang="en" hreflang="en" data-title="Selenous acid" data-language-autonym="English" data-language-local-name="English" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/%C3%81cido_selenoso" title="Ácido selenoso – Spanish" lang="es" hreflang="es" data-title="Ácido selenoso" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Azido_selenioso" title="Azido selenioso – Basque" lang="eu" hreflang="eu" data-title="Azido selenioso" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B3%D9%84%D9%86%D9%88%D8%B3_%D8%A7%D8%B3%DB%8C%D8%AF" title="سلنوس اسید – Persian" lang="fa" hreflang="fa" data-title="سلنوس اسید" 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/Acide_s%C3%A9l%C3%A9nieux" title="Acide sélénieux – French" lang="fr" hreflang="fr" data-title="Acide sélénieux" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B8%E0%A5%87%E0%A4%B2%E0%A5%87%E0%A4%A8%E0%A4%BF%E0%A4%AF%E0%A4%B8_%E0%A4%85%E0%A4%AE%E0%A5%8D%E0%A4%B2" title="सेलेनियस अम्ल – Hindi" lang="hi" hreflang="hi" data-title="सेलेनियस अम्ल" 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/Asam_selenit" title="Asam selenit – Indonesian" lang="id" hreflang="id" data-title="Asam selenit" 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/Acido_selenioso" title="Acido selenioso – Italian" lang="it" hreflang="it" data-title="Acido selenioso" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Selenigzuur" title="Selenigzuur – Dutch" lang="nl" hreflang="nl" data-title="Selenigzuur" 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%E3%82%BB%E3%83%AC%E3%83%B3%E9%85%B8" title="亜セレン酸 – Japanese" lang="ja" hreflang="ja" data-title="亜セレン酸" 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/Kwas_selenawy" title="Kwas selenawy – Polish" lang="pl" hreflang="pl" data-title="Kwas selenawy" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Acid_selenios" title="Acid selenios – Romanian" lang="ro" hreflang="ro" data-title="Acid selenios" 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%D0%B5%D0%BB%D0%B5%D0%BD%D0%B8%D1%81%D1%82%D0%B0%D1%8F_%D0%BA%D0%B8%D1%81%D0%BB%D0%BE%D1%82%D0%B0" title="Селенистая кислота – Russian" lang="ru" hreflang="ru" data-title="Селенистая кислота" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Selenasta_kislina" title="Selenasta kislina – Slovenian" lang="sl" hreflang="sl" data-title="Selenasta kislina" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Selenasta_kiselina" title="Selenasta kiselina – Serbian" lang="sr" hreflang="sr" data-title="Selenasta kiselina" 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/Selenasta_kiselina" title="Selenasta kiselina – Serbo-Croatian" lang="sh" hreflang="sh" data-title="Selenasta kiselina" 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/Seleenihapoke" title="Seleenihapoke – Finnish" lang="fi" hreflang="fi" data-title="Seleenihapoke" 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/Selensyrlighet" title="Selensyrlighet – Swedish" lang="sv" hreflang="sv" data-title="Selensyrlighet" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D0%B5%D0%BB%D0%B5%D0%BD%D0%B8%D1%81%D1%82%D0%B0_%D0%BA%D0%B8%D1%81%D0%BB%D0%BE%D1%82%D0%B0" title="Селениста кислота – Ukrainian" lang="uk" hreflang="uk" data-title="Селениста кислота" 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/Acid_selen%C6%A1" title="Acid selenơ – Vietnamese" lang="vi" hreflang="vi" 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Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r9828364">.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%}</style> <table class="infobox ib-chembox"> <caption>Selenous acid<sup id="cite_ref-hand_1-0" class="reference"><a href="#cite_note-hand-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </caption> <tbody><tr> <td colspan="2" style="text-align:center; padding:2px;"><span typeof="mw:File"><a href="/wiki/File:Selenous-acid-2D.png" class="mw-file-description" title="Structural formula"><img alt="Structural formula" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/43/Selenous-acid-2D.png/150px-Selenous-acid-2D.png" decoding="async" width="150" height="96" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/43/Selenous-acid-2D.png/225px-Selenous-acid-2D.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/43/Selenous-acid-2D.png/300px-Selenous-acid-2D.png 2x" data-file-width="1100" data-file-height="701" /></a></span> </td></tr> <tr> <td colspan="2" style="text-align:center; padding:2px;"><span typeof="mw:File"><a href="/wiki/File:Selenous-acid-from-xtal-1971-3D-balls.png" class="mw-file-description" title="Ball-and-stick model"><img alt="Ball-and-stick model" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/89/Selenous-acid-from-xtal-1971-3D-balls.png/150px-Selenous-acid-from-xtal-1971-3D-balls.png" decoding="async" width="150" height="127" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/89/Selenous-acid-from-xtal-1971-3D-balls.png/225px-Selenous-acid-from-xtal-1971-3D-balls.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/89/Selenous-acid-from-xtal-1971-3D-balls.png/300px-Selenous-acid-from-xtal-1971-3D-balls.png 2x" data-file-width="1100" data-file-height="928" /></a></span> </td></tr> <tr> <th colspan="2" style="background: #f8eaba; text-align: center;">Names </th></tr> <tr> <td colspan="2" style="text-align:left;"><a href="/wiki/Chemical_nomenclature" title="Chemical nomenclature">IUPAC names</a> <div style="max-width:22em; word-wrap:break-word; padding-left:1.7em;">Selenous acid<br />Selenic(IV) acid</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;">Selenious acid</div> </td></tr> <tr> <th colspan="2" style="background: #f8eaba; 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" class="mw-redirect" title="CAS Registry Number">CAS Number</a></div> </td> <td><style data-mw-deduplicate="TemplateStyles:r8662964">.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><span title="commonchemistry.cas.org"><a rel="nofollow" class="external text" href="https://commonchemistry.cas.org/detail?cas_rn=7783-00-8">7783-00-8</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/commons/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/commons/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/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="/w/index.php?title=JSmol&action=edit&redlink=1" class="new" title="JSmol (not yet started)">JSmol</a>)</div> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r8662964"><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=O%5BSe%2B%5D%28%5BO-%5D%29O">Interactive image</a></span></li></ul></div> </td></tr> <tr> <td><a href="/w/index.php?title=ChEBI&action=edit&redlink=1" class="new" title="ChEBI (not yet started)">ChEBI</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r8662964"><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=26642">CHEBI:26642</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/commons/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/commons/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/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="/w/index.php?title=ChemSpider&action=edit&redlink=1" class="new" title="ChemSpider (not yet started)">ChemSpider</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r8662964"><div class="plainlist"><ul><li><span title="www.chemspider.com"><a rel="nofollow" class="external text" href="http://www.chemspider.com/Chemical-Structure.1060.html">1060</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/commons/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/commons/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/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/100.029.067">100.029.067</a> </td></tr> <tr> <td><a href="/w/index.php?title=KEGG&action=edit&redlink=1" class="new" title="KEGG (not yet started)">KEGG</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r8662964"><div class="plainlist"><ul><li><span title="www.kegg.jp"><a rel="nofollow" class="external text" href="https://www.kegg.jp/entry/D05814">D05814</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/commons/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/commons/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/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="/w/index.php?title=PubChem&action=edit&redlink=1" class="new" title="PubChem (not yet started)">PubChem</a> <abbr title="Compound ID">CID</abbr></div> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r8662964"><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/1091">1091</a></span></li></ul></div> </td></tr> <tr> <td><a href="/w/index.php?title=Unique_Ingredient_Identifier&action=edit&redlink=1" class="new" title="Unique Ingredient Identifier (not yet started)">UNII</a> </td> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r8662964"><div class="plainlist"><ul><li><span title="fdasis.nlm.nih.gov"><a rel="nofollow" class="external text" href="https://fdasis.nlm.nih.gov/srs/srsdirect.jsp?regno=F6A27P4Q4R">F6A27P4Q4R</a></span><sup> <span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/commons/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/commons/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/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="/w/index.php?title=CompTox_Chemicals_Dashboard&action=edit&redlink=1" class="new" title="CompTox Chemicals Dashboard (not yet started)">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:r8662964"><div class="plainlist"><ul><li><span title="comptox.epa.gov"><a rel="nofollow" class="external text" href="https://comptox.epa.gov/dashboard/DTXSID9024300">DTXSID9024300</a> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q413722#P3117" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/commons/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/commons/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/commons/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 align="center" colspan="2"> </td></tr> <tr> <td colspan="2"><div class="mw-collapsible mw-collapsed" style="text-align: center; font-size: 95%;"> <div style="line-height: 1.6em; font-weight: bold; font-size: 100%; text-align: left; text-align:left; font-weight:normal; background:transparent;"><div><a href="/w/index.php?title=Simplified_molecular-input_line-entry_system&action=edit&redlink=1" class="new" title="Simplified molecular-input line-entry system (not yet started)">SMILES</a></div></div> <ul class="mw-collapsible-content" style="font-size: 105%; margin-top: 0; margin-bottom: 0; line-height: inherit; text-align: left; list-style: none 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:11px; line-height:120%;">O[Se+]([O-])O</div></li></ul> </div> </td></tr> <tr> <th colspan="2" style="background: #f8eaba; 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>H<sub>2</sub>SeO<sub>3</sub>  </td></tr> <tr> <td><a href="/wiki/Molar_mass" title="Molar mass">Molar mass</a> </td> <td>128.97 g/mol    </td></tr> <tr> <td>Appearance </td> <td>white <a href="/w/index.php?title=Hygroscopic&action=edit&redlink=1" class="new" title="Hygroscopic (not yet started)">hygroscopic</a> crystals </td></tr> <tr> <td><a href="/wiki/Density" title="Density">Density</a> </td> <td>3.0 g/cm<sup>3</sup> </td></tr> <tr> <td><a href="/wiki/Melting_point" title="Melting point">Melting point</a> </td> <td>decomposes at 70°C  </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>very soluble </td></tr> <tr> <td><a href="/wiki/Solubility" title="Solubility">Solubility</a> </td> <td>soluble in <a href="/wiki/Ethanol" title="Ethanol">ethanol</a> </td></tr> <tr> <td><a href="/w/index.php?title=Acid_dissociation_constant&action=edit&redlink=1" class="new" title="Acid dissociation constant (not yet started)">Acidity</a> (p<i>K</i><sub>a</sub>) </td> <td>2.46, 7.3<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td><a href="/w/index.php?title=Conjugate_base&action=edit&redlink=1" class="new" title="Conjugate base (not yet started)">Conjugate base</a> </td> <td><a href="/w/index.php?title=Hydrogenselenite&action=edit&redlink=1" class="new" title="Hydrogenselenite (not yet started)">Hydrogenselenite</a> </td></tr> <tr> <td><div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Magnetic_susceptibility" title="Magnetic susceptibility">Magnetic susceptibility</a> (χ)</div> </td> <td>−45.4·10<sup>−6</sup> cm<sup>3</sup>/mol </td></tr> <tr> <th colspan="2" style="background: #f8eaba; text-align: center;">Related compounds </th></tr> <tr> <td>Other <a href="/wiki/Ion" title="Ion">anions</a> </td> <td>{{{value}}} </td></tr> <tr> <td>Other <a href="/wiki/Ion" title="Ion">cations</a> </td> <td>{{{value}}} </td></tr> <tr> <td>Related compounds </td> <td>{{{value}}} </td></tr> <tr> <td colspan="2" style="text-align:left; background:#f8eaba;"><div style="margin:0 auto; text-align:left;"><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> </td></tr> <tr style="background:#f8eaba; border-top:2px solid transparent;"> <td colspan="2" style="text-align:center;"><span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fb/Yes_check.svg/12px-Yes_check.svg.png" decoding="async" width="12" height="12" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fb/Yes_check.svg/18px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fb/Yes_check.svg/24px-Yes_check.svg.png 2x" data-file-width="600" data-file-height="600" /></span></span><span style="display:none">Y</span> <span class="reflink plainlinks nourlexpansion"><a class="external text" href="https://simple.wikipedia.org/w/index.php?title=Special:ComparePages&rev1=464388887&page2=Selenous+acid">verify</a></span> (<a href="/w/index.php?title=Wikipedia:WikiProject_Chemicals/Chembox_validation&action=edit&redlink=1" class="new" title="Wikipedia:WikiProject Chemicals/Chembox validation (not yet started)">what is</a> <sup><span typeof="mw:File"><span><img alt="check" src="//upload.wikimedia.org/wikipedia/commons/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/commons/thumb/f/fb/Yes_check.svg/11px-Yes_check.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/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> ?) </td></tr> <tr style="background:#f8eaba; border-top:2px solid transparent;"> <td colspan="2" style="text-align:center;"><a href="/wiki/Wikipedia:Chemical_infobox#References" title="Wikipedia:Chemical infobox">Infobox references</a> </td></tr> <tr style="background:#f8eaba;"> <td style="width:40%; max-height:1px; border-top:2px solid transparent; border-right:1px solid transparent;"> </td> <td style="width:60%; max-height:1px; border-top:2px solid transparent; border-left:1px solid transparent;"> </td></tr> </tbody></table> <p><b>Selenous acid</b>, also known as <b>selenious acid</b>, is a <a href="/wiki/Chemical_compound" title="Chemical compound">chemical compound</a>. Its chemical formula is H<sub>2</sub>SeO<sub>3</sub>. It is an <a href="/wiki/Acid" title="Acid">acid</a>. It contains <a href="/wiki/Hydrogen" title="Hydrogen">hydrogen</a> and <a href="/wiki/Selenite" title="Selenite">selenite</a> <a href="/wiki/Ion" title="Ion">ions</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Properties">Properties</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selenous_acid&veaction=edit&section=1" title="Change section: Properties" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Selenous_acid&action=edit&section=1" title="Edit section's source code: Properties"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Selenous acid is a weak acid. It can be heated to make <a href="/wiki/Selenium_dioxide" title="Selenium dioxide">selenium dioxide</a>. It is more stable than <a href="/wiki/Sulfurous_acid" title="Sulfurous acid">sulfurous acid</a>. It can be crystallized as a white solid. It is a weak <a href="/wiki/Oxidizing_agent" title="Oxidizing agent">oxidizing agent</a>. It reacts with <a href="/wiki/Base_(chemistry)" title="Base (chemistry)">bases</a> to make selenites. </p> <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=Selenous_acid&veaction=edit&section=2" title="Change section: Preparation" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Selenous_acid&action=edit&section=2" title="Edit section's source code: Preparation"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>It is made by dissolving selenium dioxide in <a href="/wiki/Water" title="Water">water</a>. </p> <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=Selenous_acid&veaction=edit&section=3" title="Change section: Uses" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Selenous_acid&action=edit&section=3" title="Edit section's source code: Uses"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>It is used to dye steel a blue-grey color. It is used in the making of <a href="/wiki/Organic_chemistry" title="Organic chemistry">organic</a> compounds. </p> <div class="mw-heading mw-heading2"><h2 id="Safety">Safety</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selenous_acid&veaction=edit&section=4" title="Change section: Safety" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Selenous_acid&action=edit&section=4" title="Edit section's source code: Safety"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Selenous acid is very toxic. Just ingesting a small amount can kill you. </p> <div class="mw-heading mw-heading2"><h2 id="Related_pages">Related pages</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selenous_acid&veaction=edit&section=5" title="Change section: Related pages" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Selenous_acid&action=edit&section=5" title="Edit section's source code: Related pages"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Selenic_acid" title="Selenic acid">Selenic acid</a></li> <li><a href="/wiki/Hydroselenic_acid" class="mw-redirect" title="Hydroselenic acid">Hydroselenic acid</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Sources">Sources</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Selenous_acid&veaction=edit&section=6" title="Change section: Sources" class="mw-editsection-visualeditor"><span>change</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=Selenous_acid&action=edit&section=6" title="Edit section's source code: Sources"><span>change source</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r9724317">.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-hand-1"><span class="mw-cite-backlink"><a href="#cite_ref-hand_1-0">↑</a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r9724332">.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 id="CITEREFLide1998" class="citation book cs1">Lide, David R. (1998). <a rel="nofollow" class="external text" href="https://archive.org/details/isbn_9780849305948"><i>Handbook of Chemistry and Physics</i></a> (87 ed.). Boca Raton, Florida: CRC Press. pp. <a rel="nofollow" class="external text" href="https://archive.org/details/isbn_9780849305948/page/4">4</a>–81. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/0-8493-0594-2" title="Special:BookSources/0-8493-0594-2"><bdi>0-8493-0594-2</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Handbook+of+Chemistry+and+Physics&rft.place=Boca+Raton%2C+Florida&rft.pages=4-81&rft.edition=87&rft.pub=CRC+Press&rft.date=1998&rft.isbn=0-8493-0594-2&rft.aulast=Lide&rft.aufirst=David+R.&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2Fisbn_9780849305948&rfr_id=info%3Asid%2Fsimple.wikipedia.org%3ASelenous+acid" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://www2.ucdsb.on.ca/tiss/stretton/database/polyprotic_acids.htm">K<sub>a</sub> and pK<sub>a</sub> for Polyprotic Acids</a>. ucdsb.on.ca</span> </li> </ol></div></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://simple.wikipedia.org/w/index.php?title=Selenous_acid&oldid=9320313">https://simple.wikipedia.org/w/index.php?title=Selenous_acid&oldid=9320313</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Special:Categories" title="Special:Categories">Categories</a>: <ul><li><a href="/wiki/Category:Acids" title="Category:Acids">Acids</a></li><li><a href="/wiki/Category:Selenium_compounds" title="Category:Selenium compounds">Selenium compounds</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Pages_using_the_JsonConfig_extension" title="Category:Pages using the JsonConfig extension">Pages using the JsonConfig extension</a></li><li><a href="/wiki/Category:Chembox_CAS_registry_number_linked" title="Category:Chembox CAS registry number linked">Chembox CAS registry number linked</a></li><li><a href="/wiki/Category:ECHA_InfoCard_ID_from_Wikidata" title="Category:ECHA InfoCard ID from Wikidata">ECHA InfoCard ID from Wikidata</a></li><li><a href="/wiki/Category:Pages_using_collapsible_list_with_both_background_and_text-align_in_titlestyle" title="Category:Pages using collapsible list with both background and text-align in titlestyle">Pages using collapsible list with both background and text-align in titlestyle</a></li><li><a href="/wiki/Category:Articles_containing_unverified_chemical_infoboxes" title="Category:Articles containing unverified chemical infoboxes">Articles containing unverified chemical infoboxes</a></li><li><a href="/wiki/Category:Chembox_image_size_set" title="Category:Chembox image size set">Chembox image size set</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last changed on 24 January 2024, at 02:09.</li> <li id="footer-info-copyright">Text is available under the <a rel="nofollow" class="external text" href="//creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike License</a> and the <a href="/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License" title="Wikipedia:Text of the GNU Free Documentation License">GFDL</a>; additional terms may apply. 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