The solubility product of a sparingly soluble salt AX2 is 3.2 × 10-11 . Its solubility (in mol/L) is

Question

The solubility product of a sparingly soluble salt AX2 is 3.2 × 10-11 . Its solubility (in mol/L) is (A)  5.6 × 10-6  (B)  3.1 × 10-4  (C)  2 × 10-4  (D)  4 × 10-4

Tardigrade Admin · Accepted Answer

AX 2 arrow undersetxA 2++ underset2x2 X - K sp =4 x 3 ; x =√[3](3.2 × 10-11/4) ; x =2 × 10-4 mole / litre

Q. The solubility product of a sparingly soluble salt $A X_{2}$ is $3.2 \times 1 0^{- 11}$ . Its solubility (in mol/L) is

$5.6 \times 1 0^{- 6}$

$3.1 \times 1 0^{- 4}$

$2 \times 1 0^{- 4}$

$4 \times 1 0^{- 4}$

$A X_{2} \to x A^{2 +} + 2 x 2 X^{-}$
$K_{s p} = 4 x^{3}; x = 3 \frac{3.2 \times 1 0 ^{- 11}}{4}; x$
$= 2 \times 1 0^{- 4}$ mole / litre

Q. The solubility product of a sparingly soluble salt AX2​ is 3.2×10−11 . Its solubility (in mol/L) is

5.6×10−6

3.1×10−4

2×10−4

4×10−4