The standard enthalpy of ionization of water at 298 K from calorimetric measurements on iodine pentoxide

Abstract

We have made calorimetric measurements of the enthalpies of reaction of I 2 O 5 (c) with water and with a small excess of OH − (aq) and have combined the results to obtain ΔH 0 = 13.340 kcal mol −1 for the standard enthalpy of ionization of water. It is suggested that this approach can be applied usefully to investigation of the enthalpy of ionization of D 2 O for which there are still unresolved differences between reported values.