\( \mathrm{FeO_4^{2-}} \; \overset{+2.0\,\text{V}}{\longrightarrow} \; \mathrm{Fe^{3+}} \; \overset{0.8\,\text{V}}{\longrightarrow} \; \mathrm{Fe^{2+}} \; \overset{-0.5\,\text{V}}{\longrightarrow} \; \mathrm{Fe^0} \)
In the above diagram, the standard electrode potentials are given in volts (over the arrow).
