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What is the coordination entity formed w...

What is the coordination entity formed when excess of aquéous `KCN`, iș added to an aqueous solution of copper sulphate? Why is it that no precipitate of copper sulphide is obtained when `H_2 S(g)` is passed through this solution?

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Ans: When.KCN (aq) or .CN . ions are added in excess to än ảq. .CuSO_4. solution, the complex entity .[Cu(CN)_4]^2-. is formed. .[Cu(H_2 O)_4]^2++4 CN^- rarr[Cu(CN)_4]^2-+4 H_2 O. As CN- is a strong ligand, it forms a highily stable complex with .Cu^2 *. ion. Ori passing .H_2 ~S., free .Cu^2+. jons"are not available to form the. precipitate of CuS.
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