Relationship between the entropy of transfer of a solute and the thermodynamic functions of mixed solvents

1985 ◽  
Vol 81 (11) ◽  
pp. 2703 ◽  
Author(s):  
Eamonn de Valera ◽  
David Feakins ◽  
W. Earle Waghorne
Keyword(s):  
Thermodynamic Functions ◽  
Mixed Solvents ◽  
Entropy Of Transfer

The distribution of branched octanols between dodecane and water

1985 ◽  
Vol 63 (4) ◽  
pp. 789-792 ◽  
Author(s):  
Norman H. Sagert ◽  
Danny W. P. Lau
Keyword(s):  
Thermodynamic Functions ◽  
Distribution Data ◽  
Standard Entropy ◽  
Standard Thermodynamic Functions ◽  
Enthalpies Of Transfer ◽  
Data Standard ◽  
Gibbs Energies ◽  
Gibbs Energies Of Transfer ◽  
Branched Chain ◽  
Entropy Of Transfer

The distribution of four branched chain octanols, 3-ethyl-3-hexanol, 4-ethyl-3-hexanol, 2-ethyl-4-methylpentanol, and 4-octanol, has been measured between dodecane and water. Measurements were made at alcohol concentrations in the dodecane of less than 0.1 mol/dm3, and as a function of temperature from 10 °C to 35 °C. From these distribution data, standard thermodynamic functions for transfer were calculated. Standard Gibbs energies of transfer from water to dodecane at 25 °C were in the range −14.1 to −15.1 kJ/mol, whereas the standard enthalpies of transfer at 25 °C varied from 29 to 39 kJ/mol. Thus, the change in the standard enthalpy tends to inhibit transfer, but a large standard entropy of transfer results in dodecane being the favoured phase.

Solubility and thermodynamic functions of cefazolin acid in pure and mixed solvents at (278.15–308.15)K

2015 ◽  
Vol 387 ◽  
pp. 95-102 ◽  
Author(s):  
Jiao Zhang ◽  
Jinbo Ouyang ◽  
Hongjiao Zhang ◽  
Xin Huang ◽  
Hongxun Hao ◽  
...  
Keyword(s):  
Thermodynamic Functions ◽  
Mixed Solvents ◽  
Pure And Mixed Solvents

scholarly journals SOLVENT EFFECTS ON THE THERMODYNAMICS OF SOLVATION OF BARIUUM DIPHENYLAMINESULFONATE IN ETHANOL-WATER MIXED SOLVENTS

2013 ◽  
Vol 21 (21) ◽  
pp. 31-40
Author(s):  
Esam A. GOMAA ◽  
Elsayed M. ABOU ELLEET ◽  
E. T. HELMY ◽  
Sh. M. DEFRAWY
Keyword(s):  
Gibbs Energy ◽  
Thermodynamic Functions ◽  
Mixed Solvent ◽  
Mixed Solvents ◽  
Ion Association ◽  
Solvent Mixtures ◽  
Free Energies ◽  
Solvent Interactions ◽  
Solution Processes ◽  
Solvation Processes

The aim of this study was to determine the thermodynamic functions, Gibbs energy, enthalpy, and entropy for the solution processes of barium diphenylaminesulfonate in the mixed solvent (ethanol+water) were calculated from solubility values obtained at temperatures ranging from 293.15 K to 308.15 K. The respective thermodynamic, functions for mixing and solvation processes, as well as the activity coefficients for the solute were calculated. The solubility of solutes in mixed solvents depends primarily on the solvation of the solutes or their constituent ions by the components of the solvent mixtures. In this study, the solubility of this barium diphenyla1ninesuifonate in the mixed solvent (ethanol + water by value percent of ethanol= 0, 20, 40, 60, 80, and 100% by volume), was determined at different temperature by the solvent evaporation method. The results enable us to estimate the value of thermodynamic solubility product, Kop(th), of barium diphenylaminesulfonate in the mixed solvent. In addition, Gibbs energy, enthalpy, entropy for the solution processes, and free energies of transfer of barium diphenyla1ninesulfonate units from water to the ethanol solutions were also calculated in order to estimate the contributions of solute-solvent interactions related to ion association are based on changes in the electrostatic properties of the solvent, solute, and ion salvation as itself as on the ionic strength of the medium.

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