First slide

Solubility product(KSP)

Question

The solubility product of BaSO₄ at 18⁰C is 1.5 × 10^–9. Its solubility (mole lit^–1) at the same temperature is

Moderate

A

1.5 $\times$ 10^-9
B

1.5 $\times$ 10^-5
C

3.9 $\times$ 10^-9
D

3.9 $\times$ 10^-5

Solution

$\large BaS{O_4}\left( s \right) \rightleftharpoons \mathop {BaS{O_4}}\limits_S \left( {aq} \right)\xrightarrow{{}}\mathop {B{a^{ + 2}}}\limits_S \left( {aq} \right) + \mathop {SO_4^{ - 2}}\limits_{2S} \left( {aq} \right)$
K_sp = S²
$\large \Rightarrow 1.5\times10^{-9}=S^2\Rightarrow S=3.89\times10^{-5}$

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