Question

Sodium hydroxide solution can be used to distinguish between iron(II) sulphate solution and iron (III) sulphate solution because these solutions give different coloured precipitates with sodium hydroxide precipitate. Give the colour of precipitate formed with

1. Iron(II) sulphate solutoion
2. Iron(III) sulphate solution

Answer 1

The colour of precipitates formed is given below.

1. The reaction between NaOH and Iron(II) sulphate solution gives a dirty green precipitate of ferrous hydroxide.
2. The reaction between NaOH and Iron(III) sulphate solution gives a reddish-brown precipitate of ferric hydroxide.