Question

9.13
Aqueous oopper sulphate solution (blue in colour) gives:
0 a green precipitate with aqueous potassium fluoride and
(i) a bright green solution with aqueous potassium chloride. Explain these
experimental results.​

Answer 1

Explanation:

Aqueous copper sulphate solution is blue in colour due to presence of [Cu(H

2 O) 4] 2+ ions.

(i) It reacts with KF to form green coloured

[CuF 4 ] 2−

[Cu(H2O)4] 2+ +4F−

→[CuF4] 2−

It reacts with KCl to form bright green coloured [CuCl 4 ] 2−.

[Cu(H2O) 4 ] 2+ +4Cl −

→[CuCl4 ] 2−