Sodium Thiosulphate

Sodium Thiosulphate is an inorganic compound with the formula Na2S2O3.xH2O. Typically it is available as the white or colorless pentahydrate, Na2S2O3·5H2O. The solid is an efflorescent(loses water readily) crystalline substance that dissolves well in water. It is also called sodium hyposulfite or “hypo”.