First slide

Solubility product(KSP)

Question

The solubility of CaF₂ is 2 × 10^–4 mole/litre. Its solubility product is

Easy

A

2.0 x10^-4
B

4.0 x 10^-8
C

32 x 10^-12
D

3.2 x 10^-4

Solution

${CaF}_{2} (s) ⇌ {CaF}_{2} (aq) \to \underset{S}{{Ca}^{+ 2} (} aq) + \underset{2 S}{2 F^{-}} (aq)$
$K_{sp} = S \times (2 S)^{2} = 4 S^{3} = 4 \times {(2 \times 10^{- 4})}^{3}$
$K_{sp} = 3.2 \times 10^{- 11}$

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