Question

Determine the solubility of silver chromate at 298 K given its K_sp value is 1.1 × 10^-12.

• A. 6.5 × 10^-5
• B. 2.4 × 10^-2
• C. 3.6 × 10^-3
• D. 8.9 × 10^-4

Answer 1

Answer: (A)

${\text{Ag}}_2{\text{CrO}}_4\rightleftharpoons {\text{2Ag}}^{+}+{\text{CrO}}_4^{2-}\text{;}{\text{K}}_{\text{sp}}=\text{1.1}\times {\text{10}}^{-\text{12}}$

S 2S S

${\text{K}}_{\text{sp}}={\left[{\text{Ag}}^{+}\right]}^2\cdot \left[{\text{CrO}}_4^{2-}\right]$

K_sp = [2S]² · [S] = 4S³

${\text{S}}^3=\frac{K_{sp}}{4}=\frac{1.1\times 10^{-12}}{4}$

$⟹\text{S}=6.53\times 10^{-5}$