Chapter 2: Acids, Bases and Salts

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Acids,Bases, and Salts


A solution reacts with crushed-egg shells to give a gas that turns lime-water milky. The solution contains:

(a) NaCl

(b) HCl

(c) LiCl

(d) KCl


The eggshell is made from calcium carbonate. When calcium carbonate reacts with dilute hydrochloric acid, carbon dioxide gas is formed.

CaCO3 (s) + HCl (aq) → CaCl2 (aq) + CO2 (g) + H2O (l)

The limewater is calcium hydroxide. When the carbon dioxide gas is passed through limewater, the limewater turns milky due to the formation of calcium carbonate.

Ca(OH)2 (aq) + CO2 (g) → CaCO3 (aq) + H2O (l)

Therefore, the correct answer is (b) HCl.

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