Transition metal colours

[Cu(H₂O)₆]²⁺

Pale blue solution

Cu(OH)₂ (s)

Pale blue precipitate

[Cu(NH₃)₄(H₂O)₂]²⁺

Dark blue solution

CuCl₄^2-

Yellow solution

CoCl₄^2-

Blue solution

[Cr(H₂O)₆]³⁺

Pale purple solution, turns green when heated. (Common to appear green in solution due to impurities).

Cr(OH)₃ (s)

Dark green precipitate

[Cr(NH₃)₆]³⁺

Purple solution

[Cr(OH)₆]^3-

Dark green solution

[Mn(H₂O)₆]²⁺

Pale pink solution

Mn(OH)₂ (s)

Pale brown precipitate

[Fe(H₂O)₆]²⁺

Pale green solution

Fe(OH)₂ (s)

Dark green precipitate

[Fe(H₂O)₆]³⁺

Yellow solution

Fe(OH)₃ (s)

Orange-brown precipitate