Why only As+3 gets precipitated as and not Zn+2 as ZnS when is passed through an acidic solution con — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

The species having minimum value of sp K will get precipitated first. It is because the ionic product will exceed the solubility product of such species. The sp K of 2 3 As S is less than ZnS. But in acidic medium ionization of 2 H S is suppressed due to common ion effect. Thus, sp K of ZnS does not exceed.