Question

If $S_1, S_2, S_3$ and $S_4$ are the solubilities of $AgCl$ in water, in $0.01\, M\, CaCl_2$, in $0.01\, M\, NaCl$ and in $0.05\, M\, AgNO_3$ respectively at a certain temperature, the correct order of solubilities is

• A. $S_1 > S_2 > S_3 > S_4$
• B. $S_1 > S_3 > S_2 > S_4$
• C. $S_1 > S_2 = S_3 > S_4$
• D. $S_1 > S_3 > S_4 > S_2$

Answer 1

Answer: (B)

$S_1 > S_3 > S_2 > S_4$

Answer 2

$0.01\, M\, CaCl_2 ?$0.01, M ,NaCl ? $0.05 \,M \,AgNO_3 ?$[Ag^+][Cl^-] = K_{sp}$(const.). The concentration of common ion$\propto \frac{1}{solubility}$