15: Transition Metals - Ligand exchange

Question 1

(Cr(H2O)6)3+ + excess ammonia?

Answer 1

(Cr(NH3)6)3+
dark green –> purple

Question 2

(Cu(H2O)6)2+ + chloride ions?

Answer 2

(CuCl4)2-
Pale blue –> yellow

Question 3

(Cu(H2O)6)2+ colour?

Answer 3

Pale blue

Question 4

(CuCl4)2- colour?

Answer 4

Yellow

Question 5

(Co(H2O)6)2+ + chloride ions?

Answer 5

(CoCl4)2-
Pale pink –> Blue

Question 6

(Cu(H2O)6)2+ + excess ammonia

Answer 6

(Cu(NH3)4(H2O)2)2+
Partial substitution
Pale blue –> deep blue