The evaluation of thermodynamic functions from aqueous solubility measurements

1971 ◽  
Vol 24 (6) ◽  
pp. 1143 ◽  
Author(s):  
DM Alexander ◽  
DJT Hill ◽  
LR White
Keyword(s):  
Heat Capacity ◽  
Statistical Method ◽  
Thermodynamic Function ◽  
Thermodynamic Functions ◽  
Curve Fitting ◽  
Molar Heat Capacity ◽  
Aqueous Solubility ◽  
Partial Molar Heat Capacity ◽  
Heat Capacity Changes ◽  
Unbiased Estimates

Aqueous solubility measurements for a number of non-electrolyte solutes have been analysed using a statistical method of curve fitting to yield the best unbiased estimates of the thermodynamic function changes on solution. The variation of partial molar heat capacity changes with temperature has been discussed.

Enthalpies of solution, limiting solubilities, and partial molar heat capacities of n-alcohols in water and in trehalose crowded media

2014 ◽  
Vol 86 (2) ◽  
pp. 223-231 ◽  
Author(s):  
Guangyue Bai ◽  
Sandra C.C. Nunes ◽  
Marisa A.A. Rocha ◽  
Luís M.N.B.F. Santos ◽  
M. Ermelinda S. Eusébio ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Molar Heat Capacity ◽  
Enthalpy Of Solution ◽  
Biological Fluids ◽  
Aqueous Media ◽  
Aqueous Solubility ◽  
Enthalpies Of Solution ◽  
Partial Molar Heat Capacity ◽  
Polar Solutes ◽  
Hydrophobic Solvation

Abstract The enthalpies of solution of alcohols were determined by calorimetry in HEPES and (HEPES + trehalose) at 298.15 K. The used methodology and experiment’s design allowed us to extract from a single titration experiment the enthalpy of solution (ΔsolHm), the limiting solubility of the alcohol in each aqueous media, and an estimation of the enthalpy of solution of water in the alcohol phase. From these values the changes in Gibbs energy (ΔsolGm) and in entropy (ΔsolSm) of solution were derived. A decrease in solubility for 1-butanol and 1-pentanol in the crowded media (HEPES + trehalose) was observed which is driven by a significant decrease in the favorable enthalpy of solution. The partial molar heat capacity, in each media was determined in our heat capacity drop calorimeter, also at 298.15 K. A significant decrease of the partial molar heat capacity was observed for both alcohols in (HEPES + trehalose), which together with the obtained decrease in favorable ΔsolHm, is consistent with a decrease in hydrophobic solvation, as a result of a decrease in free solvent availability induced by the trehalose. Finally, we tentatively predict that in the aqueous media of the crowded solutions that characterize cells and biological fluids, solutes with low aqueous solubility will be more soluble, whereas the solubility of highly polar solutes will be reduced.

Partial molar heat capacity of adsorbed water on an ion-exchanger

1985 ◽  
Vol 92 ◽  
pp. 341-344 ◽  
Author(s):  
A. Nolasco ◽  
E. Julien ◽  
J. Besombes-Vailhe
Keyword(s):  
Heat Capacity ◽  
Molar Heat Capacity ◽  
Adsorbed Water ◽  
Ion Exchanger ◽  
Partial Molar Heat Capacity

scholarly journals Thermodynamic Functions of Terbium Hafnate

2021 ◽  
Vol 66 (6) ◽  
pp. 861-867
Author(s):  
A. V. Guskov ◽  
P. G. Gagarin ◽  
V. N. Guskov ◽  
A. V. Tyurin ◽  
A. V. Khoroshilov ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Thermodynamic Functions ◽  
Adiabatic Calorimetry ◽  
Molar Heat Capacity ◽  
Pyrochlore Structure ◽  
Schottky Anomaly ◽  
Temperature Range

Abstract The molar heat capacity of terbium hafnate with a pyrochlore structure was measured by relaxation and adiabatic calorimetry. The smoothed values of the molar heat capacity were used to calculate the thermodynamic functions in the temperature range 6–330 K. The general form of the Schottky anomaly was determined.

Standard Partial Molar Heat Capacity and the Volume of the Cadmium Ion in Acetonitrile at 298.15 K

2018 ◽  
Vol 92 (11) ◽  
pp. 2107-2110
Author(s):  
Ya. I. Doronin ◽  
A. N. Novikov ◽  
L. Yu. Rassokhina ◽  
E. I. Kostyleva ◽  
V. A. Vasilev ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Molar Heat Capacity ◽  
Partial Molar Heat Capacity ◽  
Cadmium Ion
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