Question

Distinguish by using HCl.

Potassium sulphite and potassium sulphide.

Answer 1

	Potassium sulphite (K2SO3)	Potassium sulphide (K2S)
1.	On adding dilute HCl, a gas with a pungent choking smell is evolved. The gas is sulphur dioxide (SO2).	On adding dilute HCl, a gas with a rotten egg smell is evolved. The gas is hydrogen sulphide (H2S).
2.	\[\ce{K2SO3 + 2HCl -> 2KCl + H2O + SO2}\]	\[\ce{K2S + 2HCl -> 2KCl + H2S}\]