Colours Of Aqueous Ions

Question 1

[Fe(H2O)6]2+ (aq)

Answer 1

Green solution

Question 2

[Fe(H2O)4(OH)2] (s)

Answer 2

Green ppt (goes brown in air)

Question 3

FeCO3 (s)

Answer 3

Green ppt

Question 4

[Cu(H2O)6]2+ (aq)

Answer 4

Blue solution

Question 5

[Cu(H2O)4(OH)2] (s)

Answer 5

Blue ppt

Question 6

[Cu(H2O)2(NH3)4]2+ (aq)

Answer 6

Deep blue solution

Question 7

CuCO3 (s)

Answer 7

Blue-green ppt

Question 8

[Fe(H2O)6]3+ (aq)

Answer 8

Purple solution / yellow-brown (due to some [Fe(H2O)5(OH)]2+

Question 9

[Fe(H2O)3(OH)3] (s)

Answer 9

Brown ppt

Question 10

[Al(H2O)6]3+ (aq)

Answer 10

Colourless solution

Question 11

[Al(H2O)3(OH)3] (s)

Answer 11

White ppt

Question 12

[Al(OH)4] - (aq)

Answer 12

Colourless solution

Question 13

[CuCl4]2-

Answer 13

Yellow - green