Acid-base properties of ion exchangers. Ⅰ. Optimising of potentiometric titration of ion exchangers exemplified by carboxylic acid resins

摘要

The aim of this work was to determined conditions for fast titration the ion exchanger in the one-sample experiment allowing obtaining its equilibrium titration curve. Carboxylic acid ion exchangers KB-4 and Dowex MAC-3 were taken as examples. They were titrated under different conditions with NaOH, KOH and Ba(OH)_2. The forward and backward titration of concentrated immersions of finely ground ion exchanger in the electrolyte solutions with 20-min intervals between additions of the titrants of high concentration gave close results, identical to the results of the batch experiment if concentration of the supporting electrolyte was sufficiently high (1 M). It appeared possible to obtain equilibrium potentiometric titration curves in one working day and use this method for express control of properties of ion exchangers.