Standard Gibbs free energy of transfer of tetramethylammonium bromide and of methylsodium sulfate from water to water + acetone at 298.15 K as deduced from vapor-pressure measurements

1978 ◽  
Vol 10 (11) ◽  
pp. 1011-1017 ◽  
Author(s):  
C Treiner ◽  
A Le Besnerais
Keyword(s):  
Free Energy ◽  
Vapor Pressure ◽  
Gibbs Free Energy ◽  
Pressure Measurements ◽  
Standard Gibbs Free Energy ◽  
Tetramethylammonium Bromide ◽  
Free Energy Of Transfer ◽  
Energy Of Transfer ◽  
Vapor Pressure Measurements

A vapor pressure method for the simultaneous determination of standard thermodynamic functions of both solutes in a ternary dilute solution

1978 ◽  
Vol 56 (6) ◽  
pp. 844-847 ◽  
Author(s):  
Claude Treiner ◽  
Pierre Tzias ◽  
Marius Chemla
Keyword(s):  
Aqueous Solution ◽  
Free Energy ◽  
Vapor Pressure ◽  
Tetrabutylammonium Bromide ◽  
Ternary Mixtures ◽  
Binary Solvents ◽  
Volatile Components ◽  
Polar Group ◽  
Free Energy Of Transfer ◽  
Energy Of Transfer

It is shown that from vapor pressure measurements on dilute solutions of ternary mixtures with one nonvolatile component, the standard free energy of transfer (ΔGt0) of both solutes from water to aqueous binary solvents can be determined simultaneously. The method is most useful in the case of volatile components. ΔGt0 values are discussed in particular in the case of the transfer of tetrahydrofuran, acetone, and acetonitrile from water to aqueous tetrabutylammonium bromide and urea solutions and compared to the case of the transfer of nonpolar solutes to the same aqueous solution. In each case, the free energy of transfer from water to an aqueous solution of a nonpolar molecule was negative, and introduction in that molecule of a polar group caused the free energy of transfer to be considerably less negative.

Standard thermodynamic transfer functions from water to water + acetone mixtures for a n-nonylcarbon chain attached to different ionic groups

1978 ◽  
Vol 56 (23) ◽  
pp. 2940-2946 ◽  
Author(s):  
Raymond Bury ◽  
Claude Treiner
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Standard Enthalpy ◽  
Transfer Functions ◽  
Mixed Solvents ◽  
Standard Entropy ◽  
Standard Gibbs Free Energy ◽  
Ionic Groups ◽  
Solvent Molecules ◽  
Energy Of Transfer

The standard enthalpy of transfer of trimethyldecylammonium bromide, tetramethylammonium bromide, methyl and decylsodium sulfate have been determined from water to water + acetone mixtures from calorimetric measurements at 298.15 K. The standard entropy function has been calculated using standard Gibbs free energy of transfer data for the same compounds. It is shown that the standard enthalpy and entropy of transfer of a n-nonylhydrocarbon chain attached to the sulfate or to the trimethylammonium groups are quite different whereas the standard Gibbs free energy functions are practically equal in the mixed solvents. It is concluded that the sign of the charge on the ionic groups is responsible for this behaviour and that the influence of this effect extends to a large number of solvent molecules. It is suggested that a similar effect may contribute to the standard enthalpy of so called reference ions: e.g. tetraphenylboron ion casting some doubt on the reliability of these extrathermodynamic approaches at least in mixed solvents, as far as the standard enthalpy function is concerned.

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