(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 :
(i) for a short time?
(ii) for a considerable time?
Write equations of the reactions involved.
(a) When an acid reacts with a metal carbonate, then a salt, carbon dioxide and water are produced.
Example: When dilute hydrochloric acid reacts with sodium carbonate, then sodium chloride, carbon dioxide and water are formed.
Na2CO3(s) + 2HCl(aq) → 2NaCl(aq) + CO2(g) + H2O(l)
(b)(i) Lime water turns milky.
Ca2(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
Calcium hydroxide Carbon dioxide
(ii) Lime water solution becomes clear.
CaCO3(s) + CO2(g)+ H2O(l) → Ca(HCO3)2