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. - Chemistry

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.

Aqueous CuSO₄ exists as [Cu(H₂O)₄]SO₄. It is blue in colour due to the presence of [Cu[H₂O)₄]²⁺ ions.

1) When KF is added:

`[Cu(H_2O)_4]^(2+) + 4F -> [Cu(F)_4]^(2+) + 4H_2O`

(Green)

2) When KCl is added:

`[Cu(H_2O)_4]^(2+) + 4Cl -> [CuCl_4]^(2-) + 4H_2O`

(bright green)

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

Concept: Bonding in Coordination Compounds - Colour in Coordination Compounds

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Chapter 9 Coordinate Compounds
Q 13 | Page 259