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dithionite
The dithionite anion (()2−), is an oxoanion of sulfur formally derived from dithionous acid, H2S2O4. ==Chemistry==
Dithionous acid has not been detected either as a pure compound or in solution. Dithionite ions undergo both acid and alkaline hydrolysis to thiosulfate and bisulfite, and sulfite and sulfide, respectively :2 S2O + H2O → S2O + 2 HSO :3 Na2S2O4 + 6 NaOH → 5 Na2SO3 + Na2S + 3 H2O
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