Qualitative analysis of iron (II) and iron (III) ions

Qualitative analysis of iron (II) and iron (III) ions

Qualitative analysis of Fe2+ salt

Common iron II salts include

  •  Ferrous sulphate: FeSO4.7H2O
  •  Ammonium ferrous sulphate (NH4)2Fe(SO4)2.6H2O
  •  Ferrous oxalate. FeC2O4

Qualitative analysis of Fe2+ salt

Addition of dilute sodium hydroxide or ammonia solution

Observation

A dirty green precipitate insoluble in excess turn brown on standing.

Fe2+(aq) + 2OH(aq) → Fe(OH)2(s)

 

Confirming presence of Iron II ions

Forms a deep blue solution with potassium hexacyanoferrate III.

Qualitative analysis of Fe3+ salt

Addition of dilute sodium hydroxide or ammonia solution

Observation

Brown ppt precipitate insoluble in excess turn brown on standing.

Fe3+(aq) + 3OH(aq) → Fe(OH)3(s)

 

Confirming presence of Iron III ions

Forms a deep blue solution with potassium hexacyanoferrate II.

Forms a red solution with ammonium thiocyanate solution.

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