Question

A solution, containing $0.01MZ{n}^{+2}$ and $0.01MC{u}^{2+}$ is saturated by passing $H_{2}S$ gas. The $S^{-2}$ concentration is $8.1\times {10}^{-21}M,Ksp$ for $ZnS$ and $CuS$ are $3.0\times {10}^{-22}$ and $8.0\times {10}^{-30}$ respectively. Which of the following will occur in the solution?

• A. $ZnS$ will precipitate
• B. $CuS$ will precipitate
• C. Both $ZnS$ and $CuS$ will precipitate
• D. Both $Z{n}^{2+}$ and $C{u}^{2+}$ will remain in the solution

Answer 1

The correct option is A $ZnS$ will precipitate

$\left(A\right)ZnS$ will parcipate

because $ksp$ for $zns$ is $3.0\times {10}^{-22}$ and $CuS$ is $8.0\times {10}^{-30}$ less the solubility product $zns$ will percipats.