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Vol. 28 No. 4 (2016): Vol 28 Issue 4

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First and Second Dissociation Constants of Some Dicarboxylic Acids and Related Thermodynamic Functions in Water-1,4-Dioxane Medium

https://doi.org/10.14233/ajchem.2016.19535
A.A. Mahmoud
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
B.M. Morcos
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
A.A. Zaghloul
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt
M.F. Amira
Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt

Corresponding Author(s) : A.A. Mahmoud

amalsaleh20032@hotmail.com

Asian Journal of Chemistry, Vol. 28 No. 4 (2016): Vol 28 Issue 4

Abstract

First and second dissociation constants (K1 and K2) of succinic acid, tartaric acid, malonic acid, maleic acid, malic acid and phthalic acid in 20 wt % 1,4-dioxane have been determined at different temperatures (30-60 °C) by using a precise electromotive force method. The thermodynamic functions of dissociation of the acids viz., DG°, DH° and DS° for the first and the second dissociation reactions of these acids have been computed, analyzed and discussed in terms of solute-solvent interactions. An extra thermodynamic analysis has been done in the light of the isoequilibrium temperature values for both reactions indicating that these reactions are entropy controlled reactions.

Keywords

Dissociation constant Dicarboxylic acids Water-1,4-Dioxane medium
Mahmoud, A., Morcos, B., Zaghloul, A., & Amira, M. (2015). First and Second Dissociation Constants of Some Dicarboxylic Acids and Related Thermodynamic Functions in Water-1,4-Dioxane Medium. Asian Journal of Chemistry, 28(4), 835–843. https://doi.org/10.14233/ajchem.2016.19535
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