Ionic EquilibriumHard

Question

Solubility product of a salt AB is 1 × 10-8 in a solution in which th concentration of A+ ions is 10-3 M. The salt will precipitate when the concentration of B- ions is kept

Options

A.between 10-8 M to 10-7 M
B.between 10-7 M to 10-8 M
C.> 10-5 M
D.< 10-8 M

Solution

AB ⇋ A+ + B-
Ksp - [A+][B-]
Salt will precipiteate of ionic conc. > Ksp
[A+][B-] > 1 × 10-8
(1 × 10-3)[B-] > 1 × 10-8
[B-] > or 1 × 10-5

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