| Question | Colour | Notes |
| [Cu(H2O)6]2+ with sodium carbonate | |
| [Fe(H2O)6]3+ with excess CONCENTRATED sodium hydroxide | |
| [Co(H2O)6]2+ with a little dilute sodium hydroxide after standing in air | |
| [Cr(H2O)6]3+ with a little ammonia | |
| [Al(H2O)6]3+ with a little ammonia | |
| [Fe(H2O)6]3+ with hydrochloric acid | |
| Fe(H2O)6]2+ with little ammonia after standing in air | |
| [Co(H2O)6]2+ with a little dilute sodium hydroxide | |
| [Al(H2O)6]3+ | |
| Fe(H2O)6]2+ with sodium carbonate | |
| [Co(H2O)6]2+ with sodium carbonate | |
| [Cr(H2O)6]3+ with hydrochloric acid | |
| [Co(H2O)6]2+ with a little ammonia | |
| [Cu(H2O)6]2+ with a little dilute sodium hydroxide | |
| [Fe(H2O)6]2+ with a little dilute sodium hydroxide after standing in air | |
| Fe(H2O)6]2+ with a little ammonia | |
| [Co(H2O)6]2+ with hydrochloric acid | |
| [Cr(H2O)6]3+ with sodium carbonate | |
| [Cu(H2O)6]2+ | |
| [Fe(H2O)6]3+ with a little ammonia | |