First slide

Solubility product(KSP)

Question

Solubility product is a measure of solubility of a substance. Solubility product of a sparingly salt, ${AB}_{2}$ is $32 \times 10^{- 18} .$ $[B^{-}]$ in the saturated solution is

Moderate

Solution

${AB}_{2} (s) \overset{}{⇌} \underset{S}{A^{+ 2} (aq)} + \underset{2 S}{2 B^{-} (aq)}$
$\begin{array}{l} K_{sp} = {(S)}^{1} {(2 S)}^{2} \\ K_{sp} = 4 S^{3} \\ 4 S^{3} = 32 \times 10^{- 18} \\ S = 2 \times 10^{- 6} \\ [B^{-}] = 2 S = 2 \times 2 \times 10^{- 6} \\ = 4 \times 10^{- 6} \end{array}$

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