Zinc Dithionate, ZnS₂O₆

Zinc Dithionate, ZnS₂O₆.6H₂O, crystallises in the triclinic system with a density of 1.915. It is prepared by interaction between barium dithionate and zinc sulphate. The crystals are stable in air and very soluble in water: the solution decomposes on boiling.

The double salts 4(NH₄)₂S₂O₆.ZnS₂O₆ and 9(NH₄)₂S₂O₆.ZnS₂O₆. 16½H₂O have been reported.

[ZnS₂O₆.6H₂O]+400Aq. = ZnS₂O₆.Aq. -2.42 Cal.