Solubility and Chemical Thermodynamics of d,l-Alanine and d,l-Serine in Aqueous NaCl and KCl Solutions

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• 作者：Sanjay Roy ; Aslam Hossain ; Bijoy Krishna Dolui
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：January 14, 2016
• 年：2016
• 卷：61
• 期：1
• 页码：132-141
• 全文大小：490K
• ISSN：1520-5134

文摘

The solubilities of d,l-alanine and d,l-serine in aqueous sodium chloride (NaCl) and potassium chloride (KCl) solutions are determined at five equidistant temperatures by using “formol titrimetry”. The thermodynamic parameters such as standard transfer Gibbs energies, entropies, and enthalpies have been evaluated at 298.15 K. Other important related parameters like molar mass, density, molar volume, dipole moment, and solvent diameter, etc., of the experimental solutions are also determined in the present study. ΔG_t,ch⁰(i), i.e., chemical effects of the transfer Gibbs energies, and TΔS_t,ch⁰(i), i.e., chemical effects of the transfer entropy of these amino acids, are also evaluated and discussed, the factors which are dependent on mainly nature of the solute, solvent, interactions between solute and solvent, etc. The nature and the extent of the involved factors, which are influencing the solvation of the amino acids in aqueous NaCl and KCl solutions, are also explained by the different physical and analytical approaches.