The dithionate (or metabisulfate) anion, S2O62−, is a sulfur oxoanion derived from dithionic acid, H2S2O6. Its chemical formula is sometimes written in a semistructural format, as [O3SSO3]2−. The sulfur atoms of the dithionate ion are in the +5 oxidation state due to the presence of the S-S bond. Generally dithionates form stable compounds tha...
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http://en.wikipedia.org/wiki/Dithionate
a salt of dithionic acid.
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https://www.infoplease.com/dictionary/dithionate
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