Question

At ${30}^{\circ }C$, the solubility of $A{g}_{2}C{O}_3(K_{sp}=8\times {10}^{-12})$ would be greatest in 1L of:

• A. $0.05MN{a}_{2}C{O}_3$
• B. $0.05MAgN{O}_3$
• C. Pure water
• D. $0.05MN{H}_3$

Answer 1

The correct option is D

$0.05MN{H}_3$

$C{O}_3^{2-}$ of $N{a}_{2}C{O}_3$ and $A{g}^{+}$ of $N{O}_3^{-}$ will exert common ion effect on $A{g}_{2}C{O}_3$ and hence decreases the solubility. Whereas $N{H}_3$ will cause the precipitation of $A{g}^{+}$ ions as $\left[Ag\right(N{H}_3{)}_2{]}^{+}$ and hence increases the solubility.