Abstract
Analysis of the neutralization curve of an ion exchanger consisting of poly(vinyl alcohol) grafted with acrylic acid, in dilute centimolar KCl support electrolyte by potassium hydroxide, shows that potassium counter-ions are not associated with the ionized functional groups. The use of simplified neutralization equations needs to verify three hypotheses: in the ion-exchanger, co-ion and hydrogen ion concentrations are negligible with respect to that of counter-ions, and in the support electrolyte the variation of counter-ion molarity if negligible during neutralization. Counter-ions, water and functional groups molarities can be computerized as a function of the neutralization rate.
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