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Transition metal ion

Transition metal ion colours.

TermDefinition
[Cr(H2O)6]3+ Pale purple
[Cr(H2O)3(OH)3] Grey-green precipitate
[Cr(OH)6]3- Dark green
[Cr(NH3)6]3+ Purple
[Fe(H2O)6]2+ Pale green
[Fe(H2O)4(OH)2] Dark green precipitate
[Fe(H2O)6]3+ Yellow
[Fe(H2O)3(OH)3] Orange-brown precipitate
[Mn(H2O)6]2+ Pale pink
[Mn(H2O)4(OH)2] Pale brown precipitate
[Cu(H2O)6]2+ Pale blue
[Cu(H2O)4(OH)2] Pale blue precipitate
[Cu(NH3)4(H2O)2]2+ Dark blue
[Cr(H2O)6]3+ + 6NH3 -> [Cr(NH3)6]3+ + 6H2O Pale purple -> Dark purple
[Cu(H2O)6]2+ + 4NH3 -> [Cu(NH3)4(H2O)2]2+ + 4H2O Pale blue -> Dark blue
[Cu(H2O)6]2+ + 4Cl- -> [CuCl4]2- + 6H2O Pale blue -> Yellow
MnO4- + 8H+ + 5Fe2+ -> Mn2+ + 4H2O + 5Fe3+ Purple -> Colourless
2Fe3+ + 2I- -> 2Fe2+ I2 Orange/brown -> Pale green/brown
Cr2O72- + 14H+ + 3Zn -> 2Cr3+ + 7H2O + 3Zn2+ Orange -> Dark green
2Cu2+ + 4I- -> 2CuI + I2 Pale blue -> Brown and white precipitate
Created by: Charlie_M
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