Aqueous copper sulphate solution (blue in colour) gives:
Question:

Aqueous copper sulphate solution (blue in colour) gives:

(i) a green precipitate with aqueous potassium fluoride, and

(ii) a bright green solution with aqueous potassium chloride

Explain these experimental results.

Solution:

Aqueous CuSO4 exists as [Cu(H2O)4]SO4. It is blue in colour due to the presence of

[Cu[H2O)4]2+ ions.

(i) When KF is added:

(ii) When KCl is added:

In both these cases, the weak field ligand water is replaced by the F and Cl ions.

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