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Transition Metals
| Metal aqua ion | Colour |
|---|---|
| [Co(H2O)6]2+ | Pink solution |
| [Co(H2O)6]2+ added 2OH/NH3 | [Co(H2O)4(OH)2] Blue/green precipitate insoluble in XS OH- |
| [Co(H2O)4(OH)2] XS 6NH3 | [Co(NH3)6]2+ Straw solution |
| [Co(H2O)6]2+ + CO3 2- | CoCO3 Pink precipictate |
| [CoCl4]2- | Blue solution |
| [Cu(H2O)6]2+ | Blue solution |
| [Cu(H2O)4(OH)2] | Blue precipitate insoluble in XS OH- |
| [Cu(H2O)4(OH)2] XS 4NH3 | [Cu(H2O)2(NH3)4]2+ Royal deep blue solution |
| CuCO3 | Green/blue precipitate |
| [CuCl4]2- | yellow solution |
| [Fe(H2O)6]2+ | Green solution |
| [Fe(H2O)4(OH)2] | Green precipitate insoluble in XS OH-/NH3 |
| FeCO3 | Green precipitate |
| [Al(H2O)6]3+ | Colourless solution |
| [Al(H2O)6]3+ (added 3OH/NH3) | [Al(H2O)3(OH)3] White precipitate insoluble in XS NH3 |
| [Al(H2O)3(OH)3] XS 6OH- | [Al(OH)6]3- Colourless solution |
| 2[Al(H2O)6]3+ +3CO3 2- | 2[Al(H2O)3(OH)3] white precipitate |
| [Cr(H2O)6]3+ | Violet solution |
| [Cr(H2O)6]3+(added 3OH/NH3) | [Cr(H2O)3(OH)3]Green precipitate |
| [Cr(H2O)3(OH)3] XS 6OH- | [Cr(OH)6]3- Green solution |
| [Cr(H2O)3(OH)3] XS 6NH3 | [Cr(NH3)6]3+ Purple solution |
| 2[Cr(H2O)6]3+ +3CO3 2- | 2[Cr(H2O)3(OH)3]Green precipitate |
| [Fe(H2O)6]3+ | Yellow solution |
| [Fe(H2O)6]3+ (added 3OH/NH3) | [Fe(H2O)3(OH)3] brown precipitate insoluble in XS OH/NH3 |
| 2[Fe(H2O)6]3+ +3CO3 2- | 2[Fe(H2O)3(OH)3] brown precipitate |