Through a solution containing Cu^(2+) and Ni^(2+),H_(2)S gas is passed after adding dil HCl, which will precipitate out and why ?

Through a solution containing Cu^(2+) and Ni^(2+),H_(2)S gas is passed

1.	Through a solution containing Cu^(2+) and Ni^(2+),H_(2)S gas is passed after adding dil HCl, which will precipitate out and why ?
Answer» SOLUTION :`CU^(2+)` will precipitate out because in the acidic MEDIUM, only IONIC product `[Cu^(2+)][S^(2-)]` exceeds the solubility product of CUS.