Thermal Diffusion of Prototropic Ions in Water

Regarding the Soret effect of prototropic ions of H+ and OH− in dilute aqueous solutions, it has been mentioned that heat-of-transport values for ions are in good agreement with those of the activation energies for ionic diffusion in the Arrhenius expression. The physicochemical significance of these facts is discussed in relation to the inclusion of thermal diffusion terms in Kramers’ formula for ordinary diffusion flux.