Determination of equilibrium constants of strong acidic ion exchange resins by potentiometric titrations

摘要

A new method for the determination of ion exchange equilibrium constants is developed. A technique based in the application of potentiometric titrations is used in the study of non selective strong acidic resins. Potentiometric titrations are carriedout without constant ionic strength, so a mathematical treatment is developed in order to take into account the estimation of the activity coefficients and the liquid junction potentials. The ion exchange thermodynamic equilibrium constants for two resins. Dowex CM-15 and Dowex C650. between the proton form and the alkaline metals at 25°C are given.