Question

What are stoichiometric equations for the reaction of (i) zinc carbonate with sulfuric acid; (ii) calcium oxide with water; and (iii) calcium hydroxide with carbon dioxide?

Answer 1

`ZnCO_3(s) + H_2SO_4(aq) rarr ZnSO_4(aq) + CO_2(g) + H_2O(l)`

Explanation:

`CaO(s) + H_2O(l) rarr Ca(OH)_2(aq)`

`Ca(OH)_2(aq) + CO_2(g) rarr CaCO_3(s) + H_2O(l)`

Carbon dioxide is known to turn limewater (`Ca(OH)_2(aq)`, sparingly soluble in water) milky due to `CaCO_3` precipitation.