Aqueous solutions containing amino acids and peptides. Part 10.—Enthalpy of interaction of glycine with some alkali metal chlorides at 298.15 K

Abstract

The enthalpies of mixing of aqueous glycine and aqueous alkali metal chloride solutions have been investigated at 298.15 K using a microcalorimetric method. The salts investigated were LiCl, NaCl, KCl and CsCl. The experimental data have been used to determine pairwise enthalpy of interaction coefficients and from these and earlier corresponding free energy coefficients the entropy coefficients have been obtained. The results indicate that the lithium ion interacts with glycine in a markedly different way to the other cations, even though the free energy coefficients are quite similar.