| Formula | Colour | State |
| Co(H2O)6 2+ | |
| Cu(H2O)6 2+ | |
| Fe(H2O)6 2+ | |
| Fe(H2O)6 3+ | |
| Cr(H2O)6 3+ | |
| Al(H2O)6 3+ | |
| Co(H2O)4(OH)2 | |
| Cu(H2O)4(OH)2 | |
| Fe(H2O)4(OH)2 | |
| Fe(H2O)3(OH)3 | |
| Cr(H2O)3(OH)3 | |
| Al(H2O)3(OH)3 | |
| | Formula | Colour | State |
| Cr(OH)6 3- | |
| Al(OH)4 - | |
| Co(NH3)6 2+ | |
| Cu(NH3)4(H2O)2 2+ | |
| Cr(NH3)6 3+ | |
| CoCO3 | |
| CuCO3 | |
| FeCO3 | |
| Cr 2+ | |
| Cr 3+ | |
| CrO4 2- | |
| Cr2O7 2- | |
|