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Dithionous acid
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<p>Dithionous acid is a <a href="/facts/Sulfur_oxoacid/SGwAkb7A">sulfur oxoacid</a> with the chemical formula H2S2O4. It has not been observed experimentally. It is the <a href="/facts/Conjugate_acid/hohgQ07M">conjugate acid</a> of the <a href="/facts/Dithionite/xu0qH2q3">dithionite</a> dianion, S2O42-. Dithionite is a well-known reducing agent. </p>