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Reference.org
Dithionic acid
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<p>Dithionic acid, H2S2O6, is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> 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 <a href="/facts/Solution_(chemistry)/MGchhMQV">solution</a>. </p>