KINETIC DATA FOR THE HEXACYANOFERRATE (II) (III) COUPLE ON PLATINUM-ELECTRODE IN VARIOUS CHLORIDES OF MONOVALENT CATIONS/

An experimental study of the hexacyanoferrate (II)/(III) couple at a p latinum disc electrode in hydrochloric acid, in alkali metal, ammonium and tetraalkylammonium chlorides solutions is carried out. Diffusion coefficients, equilibrium potentials and transfer rate constants are d etermined. Our results complete those previously published and clearly show a correlation between the magnitude of the apparent charge trans fer rate constant and the extent of cation association with both hexac yanoferrate (II) and (III) anions.