(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.

(b) What happens when carbon dioxide gas is passed through lime water?

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Solution

(a) Acids react with metal carbonates and produce metal salt, water, and carbon dioxide gas.
For example, Sodium carbonate reacts with hydrochloric acid to produce sodium chloride, water, and carbon dioxide.

$2 H C l (a q) + N a_{2} C O_{3} (s) ⟶ 2 N a C l (a q) + H_{2} O (l) + C O_{2} (g)$

(b) When $C O_{2}$ is passed through limewater,
the solution turns milky due to the formation of white precipitate of $C a C O_{3}$ . This reaction is often sued as a test to detect the evolution of $C O_{2}$ gas.

$C a (O H)_{2} (a q) + C O_{2} (g) ⟶ C a C O_{3} (s) + H_{2} O (l)$

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(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved. (b) What happens when carbon dioxide gas is passed through lime water?

(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Write chemical equation of the reaction involved.

(b) What happens when carbon dioxide gas is passed through lime water?