• Source: Dithionic acid

Dithionic acid, H2S2O6, is the inorganic compound with the formula H2S2O6. It is the doubly protonated derivative of dithionate, a well-characterized dianion. Dithionic acid is mainly observed and characterized as an aqueous solution.




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:

2 MnO2 + 3 SO2 → 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 · 2 H2O (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)↓




See also


Sodium dithionite
Hypophosphoric acid, the phosphorus equivalent.




References

Kata Kunci Pencarian:

• Kamus rumus kimia
• Dithionic acid
• Polythionic acid
• Valence (chemistry)
• Dithionous acid
• Oxyacid
• Hypophosphoric acid
• Sulfur oxoacid
• Dithionate
• Glossary of chemical formulae