Cation Test: Iron(III) Ions

Solutions containing iron(III) ions are typically yellow, reddish-brown or orange in colour depending on the concentration of iron(III) ions.
To test for the presence of iron(III) ions in solution, you may use either the sodium hydroxide test or the ammonia test.
1) Sodium Hydroxide Test - To a sample of your solution, add a few drops of sodium hydroxide solution. A reddish-brown precipitate forms. Upon addition of excess sodium hydroxide, the reddish-brown precipitate remains insoluble.
2) Ammonia Test - To a sample of your solution, add a few drops of ammonia solution. A reddish-brown precipitate forms. Upon addition of excess ammonia solution, the reddish-brown precipitate remains insoluble.

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