Nickel Thiosulphate, NiS₂O₃

Nickel Thiosulphate, NiS₂O₃.6H₂O, is readily obtained by mixing equivalent solutions of nickel sulphate and strontium thiosulphate. Insoluble strontium sulphate is filtered off, and the clear solution upon evaporation yields green triclinic prisms of nickel thiosulphate.

Stable in air at ordinary temperatures, the salt decomposes at 100° C. With ammonia it yields two ammoniates, namely, NiS₂O₃.6H₂O.4NH₃ and NiS₂O₃.3H₂O.6NH₃.