This work studied a method for computation of the main characteristics having an effect on potentiometric titration curve in ion exchanger/solution system. These are parameters of acidity of ion exchangers such as thermodynamic constant(p K⁰), apparent equilibrium constant and correction for the apparent equilibrium constant(b). For proving the theory, the carboxylic cation exchangers of a granular and fibrous type carried out an experiment on potentiometric titration curves in a wide range of concentration of the supporting electrolyte. And potentiometric titration curve obtained. An equation relation the main characteristics of ion exchange systems was obtained. As a result, it could be calculated to characteristics such as solution pH. supporting electrolyte concentration(C) and degree of neutralization of ion exchanger (x).