Strontium Tetrathionate, SrS₄O₆

Strontium Tetrathionate, SrS₄O₆, is obtained by the addition of strontium acetate to tetrathionic acid, and subsequent precipitation with absolute alcohol. It is also formed by the oxidation of strontium thiosulphate with iodine. When a solution of strontium tetrathionate is evaporated, thin prismatic crystals containing 6 molecules of water of crystallisation separate. They are not very stable, and the solution has a tendency to split up into sulphur, sulphur dioxide, and strontium sulphate.