First slide

Solubility product(KSP)

Question

The solubility product $(K_{sp})$ of the sparingly soluble salt MX at 25°C is $2.5 \times 10^{- 9}$ . The solubility of the salt (in mol $L^{- 1}$ ) at this temperature is

Easy

A

$1.0 \times 10^{- 14}$
B

$5.0 \times 10^{- 8}$
C

$1.25 \times 10^{- 9}$
D

$5.0 \times 10^{- 5}$

Solution

$MX \to M^{+} + X^{-} S S S$
$K_{sp} = S^{2}$
or S = $\sqrt{K_{sp}}$ = $\sqrt{2.5 \times 10^{- 9}} = 5.0 \times 10^{- 5} M$

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