Q6 of 28 Page 14

(a) Solution of a substance 'X' is used for testing carbon dioxide. Write the equation of the reaction of 'X' with carbon dioxide. (b) How is obtained? Write a chemical equation.

Calcium hydroxide (X) is a substance which is used for testing carbon dioxide. It is also called slaked lime. When calcium hydroxide reacts slowly with carbon dioxide, it forms a thin layer of calcium carbonate on the walls. The reaction is:

Ca(OH)2 + CO2→ CaCO3 + H2O


(b) Calcium hydroxide is obtained by the reaction of calcium oxide vigorously with water which releases a large amount of heat. The reaction is:


CaO + H2O → Ca(OH)2


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