Question

Write the balanced equation for the preparation of the following salt in the laboratory:

An insoluble base by the action of a soluble base on a soluble salt.

Answer 1

Pb(NO₃)₂ + Na₂CO₃ ⟶ PbCO₃ + 2NaNO₃

Answer 2

\[\ce{\underset{soluble salt}{CuSO4} + \underset{soluble base}{2NH4OH}-> \underset{insoluble base}{\underset{pale blue}{(NH4)2SO4}}+ Cu(OH)2\downarrow}\]