The dithionate (or metabisulfate) anion, S2O2−6, is a sulfur oxoanion derived from dithionic acid, H2S2O6. Its chemical formula is sometimes written in a semistructural format, as [O3SSO3]2−. It is the first member of the polythionates.
Compounds
Compounds containing the dithionate ion include: • sodium dithionate, Na2S2O6 • potassium dithionate, K2S2O6 • barium dithionate, BaS2O6 ==References==