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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 22, Number 6
BKCSDE 22(6)
June 20, 2001 

 
Title
The Characteristic Calculation of Carboxylic Ion Exchanger
Author
Won-Keun Son, Tae Il Kim, Sang Hern Kim, Soo-Gil Park, Jang-Hoon Chung
Keywords
Ion exchanger, Polyelectrolytes, Carboxylic ion exchanger, Potentiometric titration, Equilibrium constant.
Abstract
A method for calculating the main characteristics of a potentiometric titration curve in a carboxylic ion exchanger has been investigated. The potentiometric titration curves of simple electrolyte and ion exchangers (polyelectrolytes) showed a great difference between them. The acidity parameters of the ion exchangers, the thermodynamic constant (pK0 ), apparent equilibrium constant (K), and correction for the apparent equilibrium constant (b), were introduced and used to express the characteristics of the carboxylic ion exchanger. A characteristic equation related to the acidity parameters of the ion exchangers systems was derived. A fibrous carboxylic cation exchanger was used and potentiometric titration curves at different concentrations of the supporting electrolyte were obtained. To prove the validity of the characteristic equation, the theoretical and experimental potentiometric titration data were fitted for a Fiban K-4 ion exchanger as the concentration of the supporting electrolyte was varied. In the present study, good agreement between the data points and the fitted curves was found in all the cases. The g (number of moles of alkali to 1 g of ion exchanger) of carboxylic ion exchanger was calculated from the concentration of supporting electrolyte (C), pH of the solution, and degree of neutralization of ion exchanger (χ).
Page
559 - 564
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