First slide

Solubility product(KSP)

Question

Three sparingly soluble salts that have same solubility products are given below :
I) A₂X II) AX III) AX₃
Their solubilities in a saturated solution will be such that

Moderate

A

III > II > I
B

III > I > II
C

II > III > I
D

II > I > III

Solution

$\large {A_2}X(s) \rightleftharpoons \mathop {{A_2}X}\limits_{{S_1}} (aq) \to \mathop {2{A^ + }}\limits_{2{S_1}} (aq) + \mathop {{X^{ - 2}}}\limits_{{S_1}} \left( {aq} \right)$
$\large {K_{sp}} = {\left( {2{S_1}} \right)^2} \times {S_1} = 4S_1^3$
$\large AX(s) \rightleftharpoons \mathop {AX}\limits_{{S_2}} (aq) \to \mathop {{A^ + }}\limits_{{S_2}} (aq) + \mathop {{X^ - }}\limits_{{S_2}} {\text{(aq)}}$
$\large {K_{sp}} = S_2 \times {S_2} = S_2^2$
$\large A{X_3}(s) \rightleftharpoons \mathop {A{X_3}}\limits_{{S_3}} (aq) \to \mathop {{A^{ + 3}}}\limits_{{S_3}} (aq) + \mathop {3{X^ - }}\limits_{3{S_3}} (aq)$
$\large {K_{sp}} = {\left( {3{S_3}} \right)^3} \times {S_3} = 27S_3^4$
Given, $\large 4S_1^3=S_2^2=27S_3^4$
S₃ > S₁ > S₂

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App