Difference between revisions of "Dithionic acid"
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[[Image:Dithionic-acid-3D-balls.png|thumb|right|150px|[[Ball-and-stick model]] of the dithionic acid molecule]] | [[Image:Dithionic-acid-3D-balls.png|thumb|right|150px|[[Ball-and-stick model]] of the dithionic acid molecule]] | ||
| − | '''Dithionic acid''', H<sub>2</sub>S<sub>2</sub>O<sub>6</sub>, is a chemical compound known only in [[solution]]<ref name=G&E>{{Greenwood& | + | '''Dithionic acid''', H<sub>2</sub>S<sub>2</sub>O<sub>6</sub>, is a chemical compound known only in [[solution]]<ref name="G&E">{{Greenwood&Earnshaw2nd|pages=715–16}}.</ref>. |
== Salts == | == Salts == | ||
{{main|dithionate}} | {{main|dithionate}} | ||
| − | Dithionic acid is dibasic and [[Salt (chemistry)|salts]] called [[dithionate]]s are known. No [[acid salt]]s have been discovered. All dithionates are readily soluble in [[water]]<ref name=G&E />. They are mild oxidizing and mild reducing agents. The structure of dithionate ion is like [[ethane]], but two SO<sub>3</sub> groups adopt an almost eclipsed conformation. The | + | Dithionic acid is dibasic and [[Salt (chemistry)|salts]] called [[dithionate]]s are known. No [[acid salt]]s have been discovered. All dithionates are readily soluble in [[water]]<ref name="G&E"/>. They are mild oxidizing and mild reducing agents. The structure of dithionate ion is like [[ethane]], but two SO<sub>3</sub> groups adopt an almost eclipsed conformation. The S–S length is 215 pm; S–O bonds are rather short with bond length of 143 pm. |
== Synthesis == | == Synthesis == | ||
Revision as of 13:03, 20 August 2009
Dithionic acid, H2S2O6, is a chemical compound known only in solution[1].
Salts
Dithionic acid is dibasic and salts called dithionates are known. No acid salts have been discovered. All dithionates are readily soluble in water[1]. They are mild oxidizing and mild reducing agents. The structure of dithionate ion is like ethane, but two SO3 groups adopt an almost eclipsed conformation. The S–S length is 215 pm; S–O bonds are rather short with bond length of 143 pm.
Synthesis
Dithionates can be made by oxidizing a sulfite (from the +4 to the +5 oxidation state), but on a larger scale they are made by oxidizing a cooled aqueous solution of sulfur dioxide with MnO2:
- 2MnO2 + 3SO2 → MnS2O6 + MnSO4
The manganese dithionate solution formed can then be converted to dithionate salts of other metals by metathesis reactions:
- Ba2+(aq) + MnS2O6(aq) + MnSO4(aq) → BaSO4(s)↓ + BaS2O6·2H2O(aq)
Concentrated solutions of dithionic acid can subsequently be obtained treating a barium dithionate solution with sulfuric acid:
- BaS2O6(aq) + H2SO4(aq) → H2S2O6(aq) + BaSO4(s)↓
References
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This page was originally imported from Wikipedia, specifically this version of the article "Dithionic acid". Please see the history page on Wikipedia for the original authors. This WikiChem article may have been modified since it was imported. It is licensed under the Creative Commons Attribution–Share Alike 3.0 Unported license. |
