Distribution of H⁺ and OH^- Ion Concentration and of Specific Electric Conductance in a Water Dissociation Layer Formed in an Ion Exchange Membrane

Abstract

Distribution of H⁺ and OH^- ion concentration and of specific electric resistance in a water dissociation layer formed in an ion exchange membrane was evaluated using the theoretical equation and electrodialysis experimental results. The change of the concentration in an anion exchange membrane was larger than that in a cation exchange membrane. When Mg (OH) ₂ was precipitated on the cation exchange membrane, the change was increased. The intensity of the water dissociation reaction is accelerated due to the auto-catalytic reaction caused by quaternary ammonium groups in the anion exchange membrane or metallic hydroxides precipitated on the cation exchange membrane.