Transition Metal Complex Ion Colours

Question 1

What colour is the [Co(H2O)6] 2+ ion

Answer 1

pink solution

Question 2

What colour is the [Co(NH3)6]2+ ion

Answer 2

straw coloured solution

Question 3

What colour is the [Cu(H2O)6]2+ ion

Answer 3

Blue solution

Question 4

What colour is [Cu(H2O)4(OH)2]

Answer 4

blue ppt

Question 5

What colour is [Cu(NH3)4(H2O)2]2+

Answer 5

deep blue solution

Question 6

What colour is CuCO3

Answer 6

green ppt

Question 7

What colour is [CuCl4]2-

Answer 7

yellow-green solution

Question 8

What colour is [Fe(H2O)6]2+

Answer 8

green solution

Question 9

What colour is [Fe(H2O)4(OH)2]

Answer 9

green ppt

Question 10

What colour is FeCO3

Answer 10

green ppt

Question 11

What colour is [FeCl4]2-

Answer 11

yellow solution

Question 12

What colour is [Fe(H2O)6]3+

Answer 12

yellow solution

Question 13

What colour is [Fe(H2O)3(OH)3]

Answer 13

brown ppt

Question 14

What colour is [FeCl4]-

Answer 14

yellow solution

Question 15

What colour is [Al(H2O)6]3+

Answer 15

colourless solution

Question 16

What colour is [Al(H2O)3(OH)3]

Answer 16

white ppt

Question 17

What colour is [Al(H2O)2(OH)4]-

Answer 17

colourless solution

Question 18

What colour can you predict Sc and Zn complex solutions to be and why?

Answer 18

Colourless as fully filled d-orbitals for both atoms and ions

Question 19

What colour is VO2+

The one with an oxidation state of +5

Answer 19

yellow solution

Question 20

What colour is VO2+

The one with an oxidation state of +4

Answer 20

blue solution

Question 21

What colour is V3+

Answer 21

green solution

Question 22

What colour is V2+

Answer 22

violet solution