Transition Metal Colours

Question 1

Cu+2 + NaOH ——>
Blue Solution

Answer 1

Cu(OH)2 (s)
Blue Precipitate

Question 2

Fe+2 + NaOH ——>
Pale Green Solution

Answer 2

Fe(OH)2 (s)
Green Precipitate

Question 3

Fe(OH)2 (s) + air [H2O/O2] ——>
Green Precipitate

Answer 3

Fe(OH)3 (s)
Orange Brown Precipitate

Question 4

Fe+3 + NaOH ——>
Pale Yellow solution

Answer 4

Fe(OH)3 (s)
Orange Brown Precipitate

Question 5

Mn+2 + NaOH ——>
Pale Pink Solution

Answer 5

Mn(OH)2 (s)
Light Brown Precipitate

Question 6

Cr+3 + NaOH ——>
Pale Purple Solution

Answer 6

Cr(OH)3 (s)
Grey Green Precipitate

Question 7

Cr(OH)3 + NaOH ——>
Green Precipitate

Answer 7

[Cr(OH)6]3- (aq)
Dark-Green Solution

Question 8

[Cu(H2O)6]2+ + NH3 ——>
Pale Blue Solution

Answer 8

Cu(OH)2 (s)
Blue Precipitate

Question 9

Cu(OH)2 (s) + NH3 ——>
Blue Precipitate

Answer 9

[Cu(NH3)4(H2O)2]2+
Dark Blue Solution

Question 10

[Cu(H2O)6]2+ + 4Cl- ——>
Pale Blue Solution

Answer 10

[CuCl4]2- + 6H2O
Yellow Solution

Question 11

[Cr(H2O)6]3+ + NH3 ——>
Violet Solution

Answer 11

[Cu(NH3)6]3+
Purple Solution