The Decomposition of Aqueous Dithionite and its reactions with polythionates SnO2−6 (n = 3–5) studied by ion‐pair chromatography

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Abstract
Aqueous dithionite decomposes at 20°C and pH values not far from 7.0 to give thiosulfate and sulfite from which trithionate may form. Addition of thiosulfate accelerates this reaction only at pH < 6. The pH dependence is explained by formation of HS2O3− ions which are reduced by dithionite to HS− and SO2−3. Sulfide destroys dithionite by nucleophilic cleavage, probably with formation of sulfoxylate and thiosulfite ions. The polythionates SnO2−6 (n = 3–5) are reduced by dithionite at pH = 7.0 and 20°C according to SnO2−6 + S2O2−4 + 2 H2O→S2O32− + Sn–3SO32− + 4H1 + 2SO32− The reaction rate rapidly increases with the number n of sulfur atoms. In secondary reactions sulfite attacks SnO62− ions with thiosulfate formation.

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