The heats of oxidation of ferrous ammonium sulphate and ferrous perchlorate have been determined by their reaction with hydrogen peroxide in a solution calorimeter. For the reaction 2Fe2++ H2O2+ 2H+→ 2Fe3++ 2H2O, ΔH=–69·8 ± 0·4 kcal./mole. The third ionization potential of iron in aqueous solution, i.e., Fe2+(aq)→ Fe3+(aq)+ e–, is 115·5 kcal./mole.
A. Sousa-Alonso, I. Chadwick and R. J. Irving, J. Chem. Soc. A, 1968, 2364 DOI: 10.1039/J19680002364
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