Equilibrium Question 816

Question: Why only $ A{s^{3+}} $ gets precipitated as $ As_2S_3 $ and not $ Z{n^{2+}} $ as ZnS when $ H_2S $ is passed through an acidic solution containing $ A{s^{3+}} $ and $ Z{n^{2+}} $ -

Options:

A) Solubility product of $ As_2S_3 $ is less than that of ZnS

B) Enough $ A{s^{3+}} $ are present in acidic medium

C) Zinc salt does not ionise in acidic medium

D) Solubility product changes in presence of an acid

Show Answer

Answer:

Correct Answer: A

Solution:

$ K _{sp} $ of $ As_2S_3 $ is less than ZnS, In acidic medium ionisation of $ H_2S $ is suppressed (common ion effect) and $ K _{sp} $ of ZnS does not exceed.



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