The dissociation constant of hydrogen peroxide and the electron affinity of the HO2 radical

Abstract

Measurements are described on the dissociation constant of hydrogen peroxide in aqueous solution and from these measurements at different temperatures the heat of dissociation is evaluated. This value has enabled us to estimate the electron affinity plus the solvation energy of the O2H radical. Values of ΔG, ΔH and ΔS for the dissociation of water and hydrogen peroxide are compared. Measurements are also reported on the proton affinity of H2O2. Calculations based on existing data are given for the electron affinities and solvation energies of OH, O 2H, O2 and O2-.