First slide

Solubility product(KSP)

Question

If the K_SP of a sparingly soluble salt, A₃B₂ in water is 1.08 × 10^–8 mol⁵L^–5, its solubility in mol L^–1 is

Moderate

A

10^-1
B

10^-3
C

10^-2
D

1.08 x 10^-2

Solution

$A_{3} B_{2} (s) ⇌ \underset{S}{A_{3} B_{2} (aq}) \to \underset{3 S}{3 A^{+ x} (} aq) + \underset{2 S}{2 B^{- y}} (aq) 3 x = 2 y$
K_sp = (3S)³ × (2S)² = 108S⁵
1.08 × 10^-8 = 108 × S⁵
S = 10^-2

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