Jasra, R. V. ; Ahluwalia, J. C. (1984) Enthalpies and heat capacities of dissolution, apparent molar heat capacities, and apparent molar volumes of some mono-, di-, tri-, and tetra-saccharides in water The Journal of Chemical Thermodynamics, 16 (6). pp. 583-590. ISSN 0021-9614
Full text not available from this repository.
Official URL: http://linkinghub.elsevier.com/retrieve/pii/002196...
Related URL: http://dx.doi.org/10.1016/0021-9614(84)90010-7
Abstract
Molar enthalpies of solution at very low molalities of some mono-, di, tri, and tetra-saccharides in water have been measured at 298.15 and 308.15 K using an isoperibol calorimeter. The molar heat-capacity changes ΔsolCp, m ∞on dissolution at 303.15 K were derived from molar enthalpies of solution. A Picker flow microcalorimeter and an Anton Paar digital density meter were used to measure apparent molar heat capacities Cp, 2, φ and apparent molar volumes V2, φ of solute at 298.15 K. The various compounds studied show large positive values of ΔsolCp, m∞ and Cp, 2∞. The experimental Cp, 2∞ values are found to be much higher than values estimated using additivity relations and heat capacities for the constituent groups derived from the heat capacities of monofunctional compounds. Results further indicate that the difference in Cp, 2∞(expt) and Cp, 2∞(est.) per hydroxyl group increases with an increase in the number of hydroxyl groups in a molecule. An attempt has been made to explain the Cp, 2infinity values of stereoisomers in terms of the compatibility of the aqueous-solution conformation of the compound and the tetrahedral order in water.
Item Type: | Article |
---|---|
Source: | Copyright of this article belongs to Elsevier Science. |
ID Code: | 349 |
Deposited On: | 21 Sep 2010 04:47 |
Last Modified: | 11 May 2011 07:16 |
Repository Staff Only: item control page