First slide

Solubility product(KSP)

Question

Why only As⁺³ gets precipitated as As₂S₃ and not Zn²⁺as ZnS when H₂S is passed through an acidic solution containing As⁺³ and Zn⁺² ?

Easy

A

Solubility product of As₂S₃ is less than that of ZnS
B

Enough As⁺³ are present in acidic medium
C

Zinc salt does not ionise in acidic medium
D

Solubility product changes in presence of an acid.

Solution

Solubility of group II catioins is less than those of group IV. Classification of cations in qualitative analysis is based on their order of solubilities of their different salts.

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