It is gradually decomposed by water: 2S 2 C1 2 + 3H 2 0 = 4HC1 + 2S + H2S203, the thiosulphuric acid produced in the primary reaction gradually decomposing into water, sulphur and sulphur dioxide.
It is readily decomposed by water with formation of sulphurous, sulphuric and thiosulphuric acids, with simultaneous liberation of sulphur.
Thiosulphuric acid, formerly called hyposulphurous acid, H2S203, cannot be preserved in the free state, since it gradually decomposes with evolution of sulphur dioxide and liberation of sulphur: H 2 S 2 O 3 = S+S0 2 +H 2 O.
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