Chemistry Part-I

Book: Chemistry Part-I

Chapter: 9. Coordination Compounds

Subject: Chemistry - Class 12th

Q. No. 13 of Exercises

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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.

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

When KF is added water is replaced by fluoride ion and green colour is due to [Cu(F)4]2- ions.

When KCl is added water is replaced by chloride ion and bright green colour is due to presence of [CuCl4]2- ions.

In both the cases water , weak field ligand is replaced by fluoride and chloride ions.


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