Qualitative Analysis - Result Question 56

####59. During the qualitative analysis of a mixture containing Cu2+ and Zn2+ ions, H2S gas is passed through an acidified solution containing these ions in order to test Cu2+ alone. Explain briefly.

(1998, 2M)

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Solution:

  1. Ksp  (solubility product) of CuS is less than Ksp  of ZnS. On passing H2S(g) in acidic solution, dissociation of H2S is suppressed due to common ion effect and it provide small concentration of S2, sufficient for precipitation of CuS but insufficient for precipitation of ZnS.


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