Chemistry - Ionic Equilibrium Question with Solution | TestHub

Precipitation starts when:

$$[M^{n+}][C{O}_3^{2-}]=K_{sp}$$

1) For Barium carbonate

$$[C{O}_3^{2-}]=\frac{8.1\times 10^{-9}}{10^{-4}}=8.1\times 10^{-5}$$

Statement A is correct

2) For Silver carbonate

$$K_{sp}=[A{g}^{+}{]}^2[C{O}_3^{2-}]$$

$$[C{O}_3^{2-}]=\frac{6.9\times 10^{-12}}{(10^{-5}{)}^2}=6.9\times 10^{-2}$$

Statement C is correct

Statement B is wrong

3) Comparison

Ag₂CO₃ needs much higher CO₃²⁻ concentration

So BaCO₃ precipitates first

Statement D is correct