Email this article Thermodynamic characteristics of acid–base equilibria of glycyl-glycyl-glycine in water–ethanol solutions at 298 K
- Authors: Pham Thi L.1, Usacheva T.R.2, Sharnin V.A.2,3
-
Affiliations:
- Institute for Tropical Technology, Vietnam Academy of Science and Technology
- Ivanovo State University of Chemistry and Technology
- Krestov Institute of Solution Chemistry
- Issue: Vol 90, No 12 (2016)
- Pages: 2387-2392
- Section: Physical Chemistry of Solutions
- URL: https://journals.rcsi.science/0036-0244/article/view/169028
- DOI: https://doi.org/10.1134/S0036024416120098
- ID: 169028
Cite item
Open Access
Access granted
Subscription Access
Abstract
The enthalpies of the acid dissociation of glycyl-glycyl-glycine zwitterions and triglycinium ions are determined calorimetrically in water–ethanol solvents containing 0.0, 0.10, 0.30, and 0.50 molar fractions of ethanol at ionic strengths of 0.1 (maintained by sodium perchlorate) and Т = 298.15 K. It is found that increasing the ethanol content in the solvent enhances the endothermic effect of triglycinium ion dissociation and reduces the endothermic effect of glycyl-glycyl-glycine dissociation. The results are discussed in terms of the solvation thermodynamics.
About the authors
L. Pham Thi
Institute for Tropical Technology, Vietnam Academy of Science and Technology
Author for correspondence.
Email: pham_lan@mail.ru
Viet Nam, Hanoi, Hoang Quoc Viet
T. R. Usacheva
Ivanovo State University of Chemistry and Technology
Email: pham_lan@mail.ru
Russian Federation, Ivanovo, 153000
V. A. Sharnin
Ivanovo State University of Chemistry and Technology; Krestov Institute of Solution Chemistry
Email: pham_lan@mail.ru
Russian Federation, Ivanovo, 153000; Ivanovo, 153045
