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(a) What happens when an acid reacts with a metal carbonate? Explain with the help of an example. Give chemical equation of the reaction involved.
(b) What happens when carbon dioxide gas is passed through lime water?
(i) For a short time?
(ii) For a considerable time?
Write equations of the reactions involved.
(a) When an acid reacts with metal carbonate, it results in the formation of a salt, carbon dioxide, and water.
For example: when dilute hydrochloric acid reacts with sodium carbonate, sodium chloride, carbon dioxide, and water are formed
The chemical equation can be written as:
$Na_2CO_3(s) + 2HCl (aq) → 2NaCl(aq) + CO_2 (g) + H_2O(l)$
(b)(i) When carbon dioxide is passed through lime water for short time, lime water turns milky as CaCO3 is formed.
$Ca(OH)_2(aq) + CO_2(g) → CaCO_3(s) + H_2O(l)$
Lime water Carbon dioxide white ppt. water
(ii) When carbon dioxide is passed through lime water for a considerable amount of time, the lime water solution becomes clear i.e the milkiness disappears.
$CaCO_3(s) + CO_2(g) + H_2O(l) → Ca(HCO_3)_2(aq)$
Updated on: 10-Oct-2022
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