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KMID : 1059519860300020145
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Journal of the Korean Chemical Society
1986 Volume.30 No. 2 p.145 ~ p.151
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The Effects of Substituent, Pressure and Temperature on the Dissociation Constants of Organic Acids. (1) Dissociation Constants of Some Substituted Pyridines in Aqueous Solution
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Hwang Jung-Ui
Chung Jong-Jae
Lee Jong-Eon
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Abstract
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Using a new conductometric method, dissociation constants of 3-cyano, 4-cyano, 3-amino and 4-aminopyridine were measured in the temperature range 15 ∼ 40℃ and pressure up to 2500bar in aqueous media. This method is convenient to apply to the low dissociative acid and base but have to do tedious extrapolating procedure for the ionic conductance in elaborated temperatures and pressures and have to know any reference dissociation constant. The measured dissociation constants were increased as the temperature increase but decreased as the pressure increase. From the constants, various thermodynamic properties were evaluated and discussed for the dissociation reactions.
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KEYWORD
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