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Easily distinguish between solutions of iron(II) and iron(III) ions by performing re-dox reactions between iron’s two oxidation states. Simply add various complex ions to solutions of iron(II) or iron(III)—observe formation of the beautifully colored Prussian blue precipitate or of the deep blood-red complex, the confirming test for iron(III).


  • Oxidation & Reduction
  • Transition Metals
  • Complex Ions
  • Chemical Bonding