ix. Why is it necessary to add H2SO4 while preparing the solution of CuSO4?
2. Answer the following in one sentence :
ix. Why is it necessary to add H2SO4 while preparing the solution of CuSO4?
Answer:-
i. The aqueous solution of CuSO4 is turbid due to the formation of sparingly soluble Cu(OH)2 by hydrolysis as shown below:
\[Cu^{2+}_{(aq)} + 4H_2O_{(l)} \rightleftharpoons Cu(OH)_{2(aq)} + 2H_3O^+_{(aq)}\]
ii. If H2SO4 (i.e., H3O+ ions) are added, the hydrolytic equilibrium shifts to the left. Turbidity of Cu(OH)2 dissolves to give a clear solution. Hence, it is necessary to add H2SO4 while preparing the solution of CuSO4.