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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(a) Name the gas evolved when dilute hydrochloric acid is added to:
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(ii) Calcium carbonate
(iii) Sodium sulphite
(iv) Lead (II) sulphide
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(vi) Potassium bisulphite
(b) Give a balanced equation for each of the above reaction.

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(i) Copper carbonate is heated strongly.
(ii) Action of dilute hydrochloric acid on sodium sulphite.
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(iv) Action of dilute sulphuric acid on sodium carbonate.
(v) Addition of sodium to cold water.

Q. Identify the gas evolved when potassium sulphite is treated with dilute hydrochloric acid.

Q. When Sodium carbonate and sodium sulphite react with hydrochloric acid (two separate reactions), the gases evolved are

(a) What happens when dilute hydrochloric acid is added to sodium carbonate ? Write a balanced chemical equation of the reaction involved.

(b) Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate ? How will you test for the presence of this gas ?

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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