Put unknown substance in Sodium Hydroxide (NaOH) solution.
Aluminium, Calcium, and Magnesium ions form White Percipitate. To find out which one specifically, add more NaOH--aluminium ions dissolve in it eventually. If it doesn't dissolve its either calcium or magnesium. To find out if its calcium or magnesium, we can do flame tests (Ca--brick red flame, Mg--no particular colour)
Copper (II) ions form light blue percipitate
Iron (II) forms a dirty green percipitate
Iron (III) forms a reddish-brown percipitate
Ammonium ions react with NaOH to form ammonia and water. When ammonia and water is forms, we can heat up solution and test the gas given off with damp red litmus paper (which would turn blue).
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