Question

Given below are some chemicals.

Lead nitrate, Copper, Hydrochloric acid, Lead oxide, Iron, Sodium carbonate, Copper carbonate, Chlorine

Using suitable chemicals from the box given above, write balanced chemical equations for the preparation of the following salts.

(Note: The chemicals may be used more than once, if needed.)

1. Lead (II) carbonate
2. Copper (II) chloride
3. Iron (II) chloride

Answer 1

(a) Lead (II) carbonate is prepared by reacting lead nitrate with sodium carbonate to form lead carbonate and sodium nitrate.

\[\ce{Pb(NO3)2(aq) + Na2CO3(aq) → PbCO3(s) + 2 NaNO3(aq)}\]

(b) Copper (II) chloride is produced through the reaction between copper carbonate and hydrochloric acid which also releases water and carbon dioxide.

\[\ce{CuCO3(s) + 2 HCl(aq) → CuCl2(aq) + H2O(l) + CO2(g)}\]

Alternative method: Copper (II) chloride can also be synthesized by the direct reaction of copper metal with chlorine gas.

\[\ce{Cu(s) + Cl2(g) → CuCl2(s)}\]

(c) Iron (II) chloride is formed by reacting iron with hydrochloric acid, which results in the production of iron chloride and hydrogen gas.

\[\ce{Fe(s) + 2 HCl(aq) → FeCl2(aq) + H2(g)}\]