Ionic EquilibriumMedium

Question

M₃A₂ is a sparingly soluble salt of molar mass y g mol⁻¹ and solubility x g L⁻¹. The ratio of the molar concentration of the anion (A³⁻) to the solubility product of the salt is

Options

A.1/54 · y⁴/x⁴
B.y⁵/(108x⁴)
C.108 · x⁵/y⁵
D.1/108 · y⁴/x⁴

Solution

Sol.

Ksp = [M²⁺]³[A³⁻]²

Ksp = [3x/y]³ [2x/y]²

Ratio of [A³⁻]/ Ksp = (2x/y) / { [3x/y]³ [2x/y]² }

= 1/54 · y⁴/x⁴

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