Question

Which of the following pairs of salts will have the same relation between solubility product $\left(K_{sp}\right)$ and solubility (s)?

• A. $A_{2}BandB$
• B. $A_3{B}_{2}and{A}_2{B}_3$
• C. $A{B}_{3}andA{B}_2$
• D. $A{B}_{3}and{A}_{2}B$

Answer 1

The correct option is B $A_3{B}_{2}and{A}_2{B}_3$

$A_3{B}_2\leftrightharpoons 3A^{2+}+2B^{3-}$
3s 2s
so, $K_{sp}=\left(3s{)}^3\right(2s{)}^2=108s^4$
and
$A_2{B}_3\leftrightharpoons 2A^{3+}+3B^{2-}$
2s 3s
$K_{sp}=\left(2s{)}^2\right(3s{)}^3=108s^4$