Dithionic acid
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| Molar mass | 162.14 g mol−1 |
| Acidity (pKa) | −3.4 (estimated)[2] |
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Dithionic acid, Template:Chem2, is the inorganic compound with the formula Template:Chem2. It is the doubly protonated derivative of dithionate, a well-characterized dianion. Dithionic acid is mainly observed and characterized as an aqueous solution.[3]
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 manganese dioxide:
The manganese dithionate solution formed can then be converted to dithionate salts of other metals by metathesis reactions:
Concentrated solutions of dithionic acid can subsequently be obtained treating a barium dithionate solution with sulfuric acid:
See also
- Sodium dithionate
- Hypophosphoric acid, the phosphorus equivalent.
References
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- ↑ International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. Template:ISBN. p. 130. Electronic version.
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- ↑ Script error: No such module "citation/CS1". pp. 715-716
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