Volumetric properties of the water-ethylene glycol mixtures in the temperature range 278-333.15 K at atmospheric pressure

Density of the water-ethylene glycol binary mixtures was measured in the entire range of compositions in the temperature range 278-333.15 K (6 values) at atmospheric pressure using a vibration densimeter. Mixtures with low concentrations of ethylene glycol were studied at 15 temperatures in the range of 274-333.15 K. Excess molar volumes Vm E, the partial molar volumes of water V1 and ethylene glycol, V2, the coefficients of thermal volume expansion a of the mixture, the partial molar volume coefficients of thermal expansion of water -a1 and ethylene -a2 were calculated. Excess molar volumes were described using the Redlich-Kister equation. The density. of the mixture was found to increase with the increasing ethylene glycol concentration at all temperatures, but at low content of ethylene glycol the dependence. = f(T) of the mixture at similar to 276.5 K passed through a maximum. The coefficient a increases sharply in the composition range 0 < x < 0.2, in the range 0.5 < x < 1 remains almost unchanged, and at T > 277 K is positive for all compositions. The dependences -a1 = f (x) and -a2 = f (x) are complex in whole temperature range and are characterized by the presence of an extremum. Vm E values are negative at all temperatures, and upon increase in the temperature the deviation from ideality decreases (x is the mole fraction of ethylene glycol).