STRUCTURE OF WATERв€’GLYCINE SOLUTIONS IN SATURATED AND NEAR-SATURATED REGIONS ACCORDING TO COMPRESSIBILITY DATA
O. V. Grineva, E. V. Belyaeva
Keywords: structure of liquids, cooperative hydrogen bonds, aqueous solutions, glycine, compressibility
Pages: 1176-1180
Abstract
Ultrasonic velocity and density values are measured for aqueous solutions containing 2.00 mol.%, 4.00 mol.%, and 5.00 mol.% glycine in a temperature range of 15-65°C, 5.50 mol.% glycine (20-65°C), and 6.00 mol.% glycine (25-65°C). Adiabatic compressibilities (κS) and molar adiabatic compressibilities (ΚS) are calculated. The values of κS and ΚS decrease monotonically with an increase in glycine concentrations up to saturation at all the temperatures. The temperature dependences of κS and ΚS have minima that are typical of water and aqueous solutions; the positions of the minima depend on the glycine concentration. The temperature coefficients of the molar compressibility, ∂ΚS/∂T, change their signs from negative to positive at lower temperatures (by approximately 10 deg) than ∂κS/∂T.
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