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From the acidic solution containing copper (+2) and zinc (+2) ions, copper can be selectively precipitated using sodium sulphide.

From the acidic solution containing copper (+2) and zinc (+2) ions, copper can be selectively precipitated using sodium sulphide.

Grade:11

1 Answers

Navjyot Kalra
askIITians Faculty 654 Points
8 years ago

True : K base sp of CuS is less than K base sp of ZnS. On passing H base 2S in acidic medium, the dissociation of H base 2S is suppressed due to common ion effect and it provides [S^2-] which is just suffi-cient to cross over K base sp of CuS and not K base sp fo ZnS. Thus only CuS gets precipitated.

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