Conversion
of Fe3+
to Fe2+
ion
1.Reducing agent : Magnesium/ zinc/ any metal which is
more electropositive than Fe (reject potassium, sodium and calcium)
2.Add [magnesium] to iron (III) chloride solution. (must be a soluble salt)
3.Stir/ shake/ Heat
4.Filter
5.Green precipitate is formed when sodium hydroxide solution is added drop by drop until in
excess. Or
Dark blue precipitate formed when potassium hexacyanoferrate (III) solution is
added.
Conversion
of Fe2+
to Fe3+
ion
1.Oxidising agent as halogen:
Chlorine/ Bromine
2.Add chlorine water to solution
of iron (II) sulphate.
3.Stir/ Shake/ Warm
4.Add sodium hydroxide solution or potassium hexacyanoferrate (II) solution
5.Brown precipitate/ dark blue precipitate/blood red
solution is formed.
No comments:
Post a Comment