Abstract:

The enthalpies of solution of glycine in water and in aqueouse solutions containing LiCl, NaCl and KCl have been measured at 298.15 K. The enthalpic interac tion paramters h_(xy), h_(xxy) and h_(xyy) of glycine with the three salts have been evaluated.There are electrostatic and structural interaction between the electrolytes and glycine. The structural interaction includes the partial desolvation of the solutes and the effect of ions on the hydration structure of glycine. The enthalpic interaction parameters obtained show the dependence on the size of cations. An analysis for the enthalpic interaction parameters indicates that the structural interaction will be responsible for the dependence of the enthalpic interaction parameters on the size of cations.

Key words: Enthalpic interaction parameter, Enthalpy of solution, Glycine