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
Question
Why only As+3 gets precipitated as $As_2S_3$ and not Zn+2 as ZnS when $H_2S$ is passed through an acidic solution containing As+3 and Zn+2 ?
Answer: A
💡 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.
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