transition metal colours

Fe²⁺ or [Fe(H2O)6] ²⁺

pale green solution

Fe³⁺ or [Fe(H2O)6] 3+

yellow solution

Fe(OH)2(s)

pale green precipitate

Fe(OH)3(s)

orange- brown precipitate

Cu2+ or [Cu(H2O)6] 2+

pale blue solution

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

dark blue solution

CuCl4 2–

yellow solution

Cu(OH)2(s)

pale blue precipitate

Cr3+ or Cr(H2O)6] 3+

purple solution

Cr(H2O)5SO4 + when sulfuric acid is present

green solution

Cr2+ or Cr(H2O)6 2+

blue solution

[Cr(NH3)6] 3+

purple solution

[Cr(OH)6 ] 3–

dark green solution

Cr(OH)3(s)

grey-green precipitate

Cr2O7 2–

orange solution

Mn2+ (aq)

pale pink solution

MnO4 –

purple solution

Mn(OH)2(s)

light brown precipitate