Practical Hints on Measurement of Densities and Excess Molar Volumes

Practical Hints on Measurement of Densities and Excess Molar Volumes 

Excess molar volumes of v of 1,2-ethanediol + water were measured atp = 0.1 MPa with a faithful copy of the vibrating tube densimeter DMA 602 from Anton Paar. All binaiy mixtures were measured at the temperatures (308.2, 313.2, and 318.2) K. Values of V are negative for all the mixtures studied over the whole concentration range and for all temperatnres. Resnlts were correlated by polynomial equations of Redlich and Kister (1948). 

In this chapter, densities and molar excess volumes of binaiy (1,2-ethanediol + water) systems in the temperatnre range of 308.2-313.2 K at atmospheric pressure are reported. The measurements are part of a long-term stndy to examine the dependence of excess volumes on temperatnre. In the earlier papers (Dean, 1985 Douheiet et al., 1991 Geyeretal., in press Kapadi etal., 2000 Nittaetal., 1977 Redlich and Kister, 1948 Span and Wagner, in press) extensive database on the thermodynamic interactions in binary mixtures of 1,2-ethanediol with water was presented. The aim of this work is to provide a set of values for the characterization of the molecular interactions of these mixtures and to examine the effect of the size of alkyl group of the diol. 

3-butanediol was supphed by Merck (analytical grade, mass fraction purity 0.99). Water, used as one substance to calibrate the densimeter was filtered four times (conductance 1 ms). n-Hexane was supplied by SDS (analytical grade, mass 

The experimental values of the densities and the excess molar volumes of the binary mixtures are given in Tables 2.1. The quantity of for a mixture of two components was calculated from  

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