Question

If the solubility of a sparingly soluble salt $AX _{2}$ is $s\, mol / L$, the solubility product is

• A. $ 4s^{3}$
• B. $ 8s^{3}$
• C. $ 4s^{2}$
• D. $s^{2}$

Answer 1

Answer: (A)

$A X_{2} A_{s}^{2+}+2 \underset{2 s}{ }^{-}$
$K_{S p}=\left[A^{2+}\right]\left[X^{-}\right]^{2}$
$K_{S p}=(s)(2 s)^{2}$
$K_{S p}=(s)\left(4 s^{2}\right)$
$K_{S p}=4 s^{3}$