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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 4, Number 3
BKCSDE 4(3)
March 20, 1983 

 
Title
Thermodynamics of 2, N-Dimethyl Pyridinium Iodide in Ethanol-Water Mixture under High Pressure
Author
Jong-Gi Jee, Young-Hwa Lee, Eui-Ha Woo, Kyung-Hee Lee
Keywords
Abstract
The ionic association constants (K) of 2, N-dimethyl pyridinium iodide (2NDMPI) in 95 volume percentage ethanol-water mixture were determined by a modified UV and conductance method at 20℃∼ 50℃ under 1 to 2000 bars. The K values increase with increasing pressure and decrease with temperature. The total partial molar volume change (ΔV) has relatively small negative value and the absolute ΔV value decrease with increasing pressure and temperature. The ion size (a) and solvation number (n) of 2NDMPI were about 5 Å and changed from 1 to 3 with decreasing temperature. Other thermodynamic parameters such as enthalpy (ΔH°) and entropy (ΔS°) for the equilibrium of the 2NDMPI were evaluated. From all the parameters mentioned above, we came to conclusion that the electrostriction effect of 2NDMPI in the ethanol-water mixture is enhanced with increasing pressure and decreasing temperature.
Page
115 - 119
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