Cation Test: Iron(II) Ions

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Solutions containing iron(II) ions are typically pale green in colour.

To test for the presence of iron(II) 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 dirty-green precipitate forms. Upon addition of excess sodium hydroxide, the dirty-green precipitate remains insoluble.

2) Ammonia Test - To a sample of your solution, add a few drops of ammonia solution. A green precipitate forms. Upon addition of excess ammonia solution, the green precipitate remains insoluble.

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