| 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. |