Tests to Distinguish Iron(II) and Iron(III) ions

Tests to Distinguish Iron(II) and Iron(III) ions

  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.
Reagent
Observation
Ion presents
Solution of potassium hexacyanoferrate (II)Light blue precipitateFe2+
Dark Blue precipitateFe3+
Solution of potassium hexacyanoferrate (III)Dark blue precipitateFe2+
Greenish brown solutionFe3+
Potassium thiocyanatePinkish solutionFe2+
Blood red solutionFe3+

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