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{{Chembox |
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{{Chembox |
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| verifiedrevid = 451984881 |
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| ImageFileL1 = Dithionous acid.svg |
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| ImageFileL1 = Dithionous acid.svg |
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| ImageSizeL1 = 120px |
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| ImageFileR1 = Dithionous-acid-3D-balls.png |
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| ImageFileR1 = Dithionous-acid-3D-balls.png |
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| ImageSizeR1 = 120px |
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| IUPACName = Dithionous acid |
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| IUPACName = Dithionous acid |
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| OtherNames = Hydrosulfurous acid; Hyposulfurous acid |
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| OtherNames = Hydrosulfurous acid; Hyposulfurous acid |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| CASNo = 15959-26-9 |
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| CASNo = 15959-26-9 |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo_Ref = {{cascite|correct|??}} |
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| PubChem = 24490 |
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| PubChem = 24490 |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID = 22898 |
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| ChemSpiderID = 22898 |
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| SMILES = O=S(O)S(=O)O |
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| ChEBI_Ref = {{ebicite|correct|EBI}} |
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| StdInChI = 1S/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4) |
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| ChEBI = 29253 |
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| StdInChIKey = GRWZHXKQBITJKP-UHFFFAOYSA-N |
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| SMILES = O=S(O)S(=O)O |
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| InChI = 1/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4) |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| InChIKey = GRWZHXKQBITJKP-UHFFFAOYAX |
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| StdInChI = 1S/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4) |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey = GRWZHXKQBITJKP-UHFFFAOYSA-N |
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| InChI = 1/H2O4S2/c1-5(2)6(3)4/h(H,1,2)(H,3,4) |
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| InChIKey = GRWZHXKQBITJKP-UHFFFAOYAX |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = H<sub>2</sub>S<sub>2</sub>O<sub>4</sub> |
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| Formula = H<sub>2</sub>S<sub>2</sub>O<sub>4</sub> |
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| MolarMass = 130.144 g/mol |
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| MolarMass = 130.144 g/mol |
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| Appearance = |
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| Appearance = |
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| Density = |
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| Density = |
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| MeltingPt = |
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| MeltingPt = |
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| BoilingPt = |
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| BoilingPt = |
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| Solubility = |
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| Solubility = |
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| ConjugateBase = ] |
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| pKa = 0.35, 2.45 <ref name="InorgChem">{{cite book |
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| title = Inorganic Chemistry, 3rd Edition |
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| chapter = Chapter 16: The group 16 elements |
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| author1 = Catherine E. Housecroft |
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| author2 = Alan G. Sharpe |
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| publisher = Pearson |
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| year = 2008 |
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| isbn = 978-0-13-175553-6 |
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| page = 520 |
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}}</ref> |
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| Section3 = {{Chembox Hazards |
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|Section3={{Chembox Hazards |
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| MainHazards = |
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| MainHazards = |
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| FlashPt = |
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| FlashPt = |
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| Autoignition = |
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| AutoignitionPt = |
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}} |
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|Section4={{Chembox Related |
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| OtherCompounds = ]<br />]<br />] |
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'''Dithionous acid''' is a ] with the chemical formula H<sub>2</sub>S<sub>2</sub>O<sub>4</sub>. It is unstable in pure form,<ref>{{cite journal | doi = 10.1021/jp972658d | title = Structures and Energies of Various Isomers of Dithionous Acid, H2S2O4, and of Its Anion HS2O4- 1 | year = 1998 | last1 = Drozdova | first1 = Yana | last2 = Steudel | first2 = Ralf | last3 = Hertwig | first3 = Roland H. | last4 = Koch | first4 = Wolfram | last5 = Steiger | first5 = Thomas | journal = The Journal of Physical Chemistry A | volume = 102 | issue = 6 | pages = 990}}</ref> but its ], known as ]s, are stable. |
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'''Dithionous acid''' is a ] with the chemical formula H<sub>2</sub>S<sub>2</sub>O<sub>4</sub>. It has not been observed experimentally.<ref name="drozdova">{{cite journal | doi = 10.1021/jp972658d | title = Structures and Energies of Various Isomers of Dithionous Acid, H2S2O4, and of Its Anion HS2O4- 1 | year = 1998 | last1 = Drozdova | first1 = Yana | last2 = Steudel | first2 = Ralf | last3 = Hertwig | first3 = Roland H. | last4 = Koch | first4 = Wolfram | last5 = Steiger | first5 = Thomas | journal = The Journal of Physical Chemistry A | volume = 102 | issue = 6 | pages = 990–996 | bibcode = 1998JPCA..102..990D}}</ref> It is the ] of the ] dianion, S<sub>2</sub>O<sub>4</sub><sup>2-</sup>. Dithionite is a well-known reducing agent. |
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==See also== |
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==Related compounds== |
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*] (H<sub>2</sub>S<sub>2</sub>O<sub>6</sub>), another unstable protonated sulfur oxide, derived from dithionate. |
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* ] |
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* ] |
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==References== |
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==References== |
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{{reflist}} |
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{{reflist}} |
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] |
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{{inorganic-compound-stub}} |
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] |
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{{inorganic-compound-stub}} |