ISSN:
0022-3832
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The ion exchange equilibrium constants were obtained by measurements of infrared spectra of the ion exchange resin phase, using carboxymethylcellulose film (degree of etherification 0.66) as ion exchanger. The apparent constants are calculated by the following equation: \documentclass{article}\pagestyle{empty}\begin{document}$${\rm p} K_a = r_{\rm B} \log {\rm \varepsilon }_{\rm A} \log k\varepsilon _{\rm B} - (r_{\rm B} - r_{\rm A} ){\rm }\log {\rm }(\varepsilon _{\rm A} + k\varepsilon _{\rm B} ) + r_{\rm A} \log B^{ + r_{\rm B} } - r_{\rm B} \log A^{ + r_{\rm A} } + \log {\rm }(\gamma _{\rm B}^{r_{\rm A} } /\gamma _{\rm A}^{r_{\rm B} } )$$\end{document} where A and B are the concentrations of the two exchangeable cations, respectively, rA is the valence of the A ion, γA is the activity coefficient of the A ion in the electrolyte solution, ∊A is absorption intensity of carbonyl band of the carboxy radical having the A ion in an exchanger, and k is a constant. The dependence of the apparent equilibrium constants on pH and the ionic concentration in the electrolyte was investigated in the Na-H, K-H, NH4-H, Ca-H, and Sr-H exchange systems. Further, the activity coefficients of the exchangeable ions in the resin phase were evaluated in both the uniunivalent and unidivalent exchange systems. It is concluded that the abnormal behavior of the coefficients in the resin phase would be explained by the interaction energy between the ion pairs in the resin phase, independent of the concentration of the electrolyte solutions, in the range of comparatively dilute electrolyte solutions.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1956.120209614
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