Question

In a saturated solution of Ag2CO3, silver ion concentration is 2 × 10–4 M. Its solubility product is

• A. 4 × 10–12
• B. 3.2 × 10–11
• C. 8 × 10–12
• D. 10–12

Answer 1

Answer: (A)

4 × 10–12

Answer 2

Ag2CO3 $\rightleftharpoons$ 2Ag+ + CO32–

2s s

Here [Ag+] = 2 s = 2 × 10–4 M

$\Rightarrow$ s = 1 × 10–4

\KSP = 4 s3 = 4 (1 × 10–4 )3 = 4 × 10–12