ligand substitution reactions

Question 1

[Cu(H2O)6]2+ + 4NH3 makes [Cu(NH3)4(H2O)2]2+ + 4H2O

Answer 1

pale blue (aq) to dark blue (aq)

Question 2

[Cu(H2O)6]2+ + 4Cl- makes (reversible) [CuCl4]2- + 6H2O

Answer 2

pale blue (aq) to yellow (aq)

Question 3

[Cr(H2O)6]3+ + excess 6NH3 makes [Cr(NH3)6]3+ + 6H2O

Answer 3

violet to purple

Question 4

pale blue (aq) to dark blue (aq)

Answer 4

[Cu(H2O)6]2+ + 4NH3 makes [Cu(NH3)4(H2O)2]2+ + 4H2O

Question 5

pale blue (aq) to yellow (aq)

Answer 5

[Cu(H2O)6]2+ + 4Cl- makes (reversible) [CuCl4]2- + 6H2O

Question 6

violet to purple

Answer 6

[Cr(H2O)6]3+ + excess 6NH3 makes [Cr(NH3)6]3+ + 6H2O