hi Can show me how resolve this leaching problem.

A leach liquor at a $pH$ of $2$ containing metal ions: $C{u}^{2+},N{i}^{2+},$ and $M{n}^{2+},$ each at a

concentration of $0\mathrm{.}01M,$ is treated with $H_{2}S$ gas at $25C.$ In the light of the given

data what is your opinion about selective precipitation of CuS at this $pH?$ What

is the concentration of $C{u}^{2+}$ ions left in the leach liquor after equilibrium is

attained? Calculate the $pH$ required for precipitation of $MnS.$