First slide

Solubility product(KSP)

Question

The solubility product to different sparingly soluble salts are
1) XY = 4 × 10^–20
2) X₂Y = 3.2 × 10^–11
3) XY₃ = 2.7 × 10^–31
The increasing order of solubility is

Moderate

A

1,2,3
B

2,1,3
C

1,3,2
D

3,1,2

Solution

$1) XY (s) ⇌ XY (aq) \to \underset{}{\underset{S_{1}}{X^{+}} + \underset{S_{1}}{Y^{-}}}$
K_sp = S₁ x S₁ ⇒ S₁ = 2 $\times$ 10^-10
$2) X_{2} Y (s) ⇌ \underset{S_{2}}{XY} (aq) \to \underset{2 S_{2}}{2 X^{+}} (aq) + \underset{S_{2}}{Y^{- 2}} (aq)$
K_sp = (2S₂)² x S₂ ⇒ 3.2 x 10^-11 = 4S₂³
⇒ S₂ = 2 x 10^-4
$3) {XY}_{3} (s) ⇌ \underset{S_{3}}{{XY}_{3} (a} q) \to \underset{S_{3}}{X^{+ 3}} (aq) + \underset{3 S_{3}}{3 Y^{-}} (aq)$
K_sp = (S₃)² x (3S₃) ⇒ 2.7 x 10^-31 = 27S₃⁴
⇒ S₃ = 10^-8

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