A solution of sodium thiosulphate become cloudy with the formation of a yellow precipitate when left in air.   Explain.       

A solution of sodium thiosulphate become cloudy with the formation of a yellow precipitate when left in air.   Explain.       

carbon dioxide dissolve in water to form carbonic acid; the acid hydrolyzes thiosulphate to yellow sulphur

S2O32- (aq) + 2H+ (aq)  → H2O (l) + SO2 (g) + S (s)

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