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Thermodynamic dissociation constants of salicylic and monochloroacetic acids in mixed solvent systems from conductance measurements at 25°C
Authors:M. S. K. Niazi  M. Z. I. Khan
Affiliation:(1) Department of Chemistry, Quaid-i-Azam University, Islamabad, Pakistan
Abstract:The molar conductances of dilute solutions of salicylic and monochloroacetic acids in binary mixtures of methanol, ethanol, 1-propanol, N,N-dimethylformamide, acetone, acetonitrile, tetrahydrofuran and dioxane with water have been measured at 25°C. The Lee-Wheaton conductance equation was fitted to the data in order to derive thermodynamic dissociation constants and limiting molar conductances. The results were compared with those in the literature pertaining to analogous media, mostly derived potentiometrically. The findings are interpreted in terms of a solvent effect on the ionization of these acids in mixed solvent systems.This paper is dedicated to the late Professor Raymond M. Fuoss on his 3rd anniversary.
Keywords:Conductance  acid dissociation constants  salicylic acid  monochloroacetic acid  methanol  ethanol  1-propanol  dimethylformamide  acetone  acetonitrile, tetrhydrofuran  dioxane
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