Question

At ${30}^{o}C$, the solubility of ${Ag}_2{CO}_3$ $(K_{sp}=8\times {10}^{-12})$ would be greatest in one litre of:

• A. $0.05M$ ${Na}_2{CO}_3$
• B. $0.05M$ $Ag{NO}_3$
• C. Pure water
• D. $0.05M$ ${NH}_3$

Answer 1

Answer: (D)

$0.05M$ ${NH}_3$

In pure water,

$A{g}_{2}C{O}_3\rightleftharpoons 2A{g}^{+}+C{O}_3^{2-}$

In $N{H}_3$,

$A{g}_{2}C{O}_3\rightleftharpoons 2A{g}^{+}+C{O}_3^{2-}$

$2A{g}^{+}+4N{H}_3\rightleftharpoons 2Ag[N{H}_3{]}_2^{+}$

Here a complex formation is taking place,due to formation of complex reaction is taking place in forward direction so solubiltiy will increases.

Due to presence of common ion in $N{a}_{2}C{O}_3$ and in $AgN{O}_3$ the solubility will decrease.