The effect of ionic activity and association on the kinetics of ionic reactions. Part II. The kinetics and equilibria of chloride substitution in aquopenta-amminecobalt(III) ions

Abstract

The chloride ion substitution of aquopenta-amminecobalt(III) in solutions of ionic strengths between 0 and 1 is interpreted quantitatively in terms of a dissociative interchange mechanism involving ion pairs and ion triplets. The experimental results can be reproduced by this mechanism using rate and equilibrium constants at zero ionic strength combined with corrections calculated from independent measurements of ionic activity and ion association constants.