Partial Molar Volumes of Glycine in Aqueous Electrolyte and Non-Electrolyte Solutions

Abstract

Partial molar volumes (\(\varphi^0\)_v) of glycine (c=0.02-0.22 mol^.dm^-3) in aqueous electrolyte solutions (NaCl and KCl, c=0.15, 0.45 and 0.60 mol^.dm^-3) and non-electrolyte solutions (sucrose, c=0.15, 0.45 and 0.60 mol^.dm^-3)  were determined at 298.15 K. Partial molar volume of transfer (\(\Delta\)_tr\(\varphi^0\)_v) of glycine from aqueous to aqueous electrolyte and non-electrolyte solutions has been calculated and interpreted in terms of different interactions. Dominating hydrophilic-hydrophilic or ion-hydrophilic interactions are observed in present systems and these interactions strengthen with increase in concentration of salts and sucrose. Hydration behavior of glycine perturbs in presence of salts and sucrose through solvation and hydrogen bonding effects of co-solutes and resulted in the overall enhancement of water structure.