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Received June 12, 2019
Accepted August 6, 2019
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Experimental Measurement and Correlation of two α-Amino Acids Solubility in Aqueous Salts Solutions from 298.15 to 323.15 K

1Department of Chemistry, Faculty of Science, Northern Border University, Arar, Kingdom of Saudi Arabia 2Department of Chemistry, Faculty of Science and Technology, Omdurman Islamic University, Sudan 3Institut Préparatoire aux Etudes Scientifiques et Techniques 99/UR/1201 Unité de Recherches de Physico-Chimie Moléculaire, Université de Carthage, Sudan, Saudi Arabia
Korean Chemical Engineering Research, February 2020, 58(1), 98-105(8), 10.9713/kcer.2020.58.1.98 Epub 4 February 2020
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Abstract

By the gravimetric method at atmospheric pressure, the solubility of two α-amino acids was resolved over temperatures from (293.15 to 323.15) K. The α-amino acids studied were L-arginine and L-histidine. Results showed a salting-out effect on the solubility of the tested amino compounds. It is obvious that there was an increase in the solubility, in aqueous chloride solutions, with the increasing temperature. Results were translated regarding the salt hydration shells and the ability of the solute to form hydrogen-bond with water. The solubility data was precisely associated with a semiempirical equation. The standard molar Gibbs free energies of transfer of selected α-amino compounds (ΔtrG°) from pure water to aqueous solutions of the chloride salts have been calculated from the solubility data. The decrease in solubility is correlated to the positive (ΔtrG°) value which is most part of the enthalpic origin.

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