The solubility product of As 2 O 3 is 10.8 × 10-9. It is 50 % dissociated in saturated solution. The solubility of salt is

Question

The solubility product of As 2 O 3 is 10.8 × 10-9. It is 50 % dissociated in saturated solution. The solubility of salt is (A) 10-2 (B)  2× 10-2 (C)  5× 10-3 (D)  5.4× 10-9

Tardigrade Admin · Accepted Answer

As 2 O 3 leftharpoons 2 As 3++3 O 2- Ks p =(2 S)2(3 S)3 10.8 × 10-9 =108 S3 S =10-2 If dissociation is 50 % then solubility is 2 × 10-2 mol / L.

Q. The solubility product of $A s_{2} O_{3}$ is $10.8 \times 1 0^{- 9}$ . It is $50%$ dissociated in saturated solution. The solubility of salt is

$1 0^{- 2}$

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

$5 \times 1 0^{- 3}$

$5.4 \times 1 0^{- 9}$

$A s_{2} O_{3} ⇌ 2 A s^{3 +} + 3 O^{2 -}$
$K_{s p} = (2 S)^{2} (3 S)^{3}$
$10.8 \times 1 0^{- 9} = 108 S^{3}$
$S = 1 0^{- 2}$
If dissociation is $50%$ then solubility is $2 \times 1 0^{- 2} m o l / L$ .

Q. The solubility product of As2​O3​ is 10.8×10−9. It is 50% dissociated in saturated solution. The solubility of salt is

10−2

2×10−2

5×10−3

5.4×10−9