Chemistry
Identify the gas evolved and give the chemical test when dilute hydrochloric acid reacts with :
(i) Sodium sulphite.
(ii) Iron [II] sulphide.
Hydrogen Chloride
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Answer
(i) SO2 is evolved when dilute hydrochloric acid reacts with sodium sulphite.
Na2SO3 + 2HCl ⟶ 2NaCl + H2O + SO2 [g]
(ii) H2S gas is evolved when dilute hydrochloric acid reacts with Iron [II] sulphide.
FeS + 2HCl ⟶ FeCl2 + H2S
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