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Question
What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when H2S(g) is passed through this solution?
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Solution
When aqueous KCN solution is added to aqueous copper sulphate solution, [Cu(CN)4]2− coordination species is obtained as follows:
\[\ce{[Cu(H2O)4]^2+ + 4CN- -> [Cu(CN)4]^2- + 4H2O}\]
The coordination species thus formed [Cu(CN)4]2− is very stable because CN– is a strong ligand. Hence, on passing H2S gas through this solution, CuS precipitate is not obtained because free Cu2+ ions are unavailable.
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