1. Tardigrade
  2. Question
  3. Chemistry
  4. H2S is passed into one nm3 of a solution containing 0.1 mole of Zn2+ and 0.01 mole of Cu2+ till the sulphide ion concentration reaches 8.1 ×10 -19 moles. Which one of the following statements is true? [Ksp of ZnS and CuS are 3 × 10-22 and 8 × 10-36 respectively

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Q. $H_2S$ is passed into one $nm^3$ of a solution containing $0.1$ mole of $Zn^{2+}$ and $0.01$ mole of $Cu^{2+}$ till the sulphide ion concentration reaches $8.1 \times10^ {-19}$ moles. Which one of the following statements is true?
$[K_{sp}$ of $ZnS$ and $CuS$ are $3 \times 10^{-22}$ and $8 \times 10^{-36}$ respectively

KCETKCET 2011Equilibrium

Solution:

The ionic product for $ZnS \left(0.1 \times 8.1 \times 10^{-19}\right)$ and for CuS $\left(0.01 \times 8.1 \times 10^{-19}\right)$ exceeds their $K_{sp}$ values. Hence, both get precipitated.