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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 6, Number 5
May 20, 1985 

The Pressure Effect on the Ionization of m-Chloroanilinium Ion in Sodiumacetate Buffer Solution
Jong-Gi Jee, Young-Hwa Lee, Young-Jik Kwak
The dissociation constants(K) of m-chloroanilinium ion in water-ethanol mixture, where the volume percentage of water is 89.5%, were evaluated by UV-spectroscopic method at 20∼50℃, up to 1500 bars with changing ionic strength from 0.04 to 0.10 mol kg-1 by use of acetate buffer. K values enhance with increasing ionic strength and temperature, but decrease with elevating pressure. From K values, we obtained the partial molar volume change and some other thermodynamic parameters. From the values of enthalpy, entropy and isoequilibrium temperature (649 K), we concluded that the dissociation of m-chloroanilinium ion mentioned above is controlled by enthalpy.
266 - 269
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