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Iron exists in the body as iron(II) and iron(III) ions. Interconversion of the two forms takes place through the loss or gain of an electron. With the Oxidation–Reduction Survey: Iron(II) and Iron(III) Reactions—ChemTopic™ Lab Activity, investigate the role of electron transfer in the reactions of iron(II) and iron(III) ions with oxidizing and reducing agents, respectively, then analyze the results to determine the change in oxidation state for each reactant, the oxidation and reduction half-reactions and the balanced chemical equation for the overall redox reaction.