Chem 5 - AQA Transition metals

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Iron 2 is always green,
Co 2 is blue,
Copper goes from light to dark,
Iron 3 looks like poo.

Cr 3 is red in water,
and with excess ammonia purple is seen,
Aluminium's white or a clear solution,
everything else, is f***ing green.

All jokes aside,

Fe 2+ is always green, Fe 3+ is always brown. Easy.

Cobalt I consider like that colour change mouth wash. Pink untill you shake it and it turns blue. Its pink with water then add stuff and it goes blue (Except excess ammonia - Brown).

Copper is blue. Pale blue bar excess ammonia/CO3 which is dark blue/blue green respectively.

Aluminium has no colour as its not transitional

And chromium is a complete a** of a metal in that it takes any colour... like what the hell. I normally just put green if in doubt.

Chromium is not as hard to remember as you think, remember potassium dichromate? It's orange in 6+ dichromate form, yellow in the single CrO4^2- ion from the equilibrium being allowed to shift. Green when you oxidise it to Cr3+ and Cr2+ is blue, although I don't think you need to know that one