ACTIVITY COEFFICIENTS OF ORGANIC ELECTROLYTE SOLUTIONS. Ⅰ: AQUEOUS SOLUTIONS OF SODIUM SALTS OF CARBOXYLIC ACIDS

摘要

An estimation method is proposed for the activity coefficients of organic electrolytes. It considers the activity coefficient as consisting of three parts: an electrolytic term, a nonelectrolytic one, calculated with the UNIFAC equation, based on group contributions and a third term due to association processes of organic ions. It was observed that γ_(assoc). is a universal function of a reduced concentration, in the case of aqueous solutions of carboxylic acid salts. The signification of the reference concentration used in the calculation of the reduced one is analyzed.