Chemical Structure
The anion is a hybrid of dithionite (S2O42-) and dithionate (S2O62-). The anion consists of an SO2 group linked to an SO3 group, with the negative charge more localized on the SO3 end. The S-S bond length is 2.22 Å and the "thionate" and thionite" S-O distances are 1.46 and 1.50 Å, respectively.
Read more about this topic: Sodium Metabisulfite
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