Name the gas evolved when dilute hydrochloric acid is added to: [2 MARKS]
a) Calcium carbonate
b) Sodium sulphite

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Solution

Each Part: 1 Mark

a) When dilute hydrochloric acid is added to calcium carbonate, carbon dioxide is evolved.
$C a C O_{3} + 2 H C l \to C a C l_{2} + H_{2} O + C O_{2}$

b) When dilute hydrochloric acid is added to sodium sulphite, sulphur dioxide is evolved.
$N a_{2} S O_{3} + 2 H C l \to 2 N a C l + H_{2} O + S O_{2}$

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Name the gas evolved when dilute hydrochloric acid is added to: [2 MARKS] a) Calcium carbonate b) Sodium sulphite

Each Part: 1 Mark a) When dilute hydrochloric acid is added to calcium carbonate, carbon dioxide is evolved. CaCO3+2HCl→ CaCl2+H2O+CO2 b) When dilute hydrochloric acid is added to sodium sulphite, sulphur dioxide is evolved. Na2SO3+2HCl→ 2NaCl+H2O+SO2

Name the gas evolved when dilute hydrochloric acid is added to: [2 MARKS]
a) Calcium carbonate
b) Sodium sulphite