Identifying Cations - Tests to Distinguish Iron(II) and Iron(III) ions.

Some Tests to Distinguish Fe2+ ion From Fe3+ Ion

  1. The presence of Fe2+ ion and Fe3+ ion in a salt can be confirmed by using solution of potassium hexacyanoferrate (II), solution of potassium hexacyanoferrate (III) and potassium thiocyanate.
  2. Table below shows the observation of the tests.

Ion presents
Solution of potassium hexacyanoferrate (II) Light blue precipitate Fe2+
Dark Blue precipitate Fe3+
Solution of potassium hexacyanoferrate (III) Dark blue precipitate Fe2+
Greenish brown solution Fe3+
Potassium thiocyanate Pinkish solution Fe2+
Blood red solution Fe3+


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