Abstract
The density, isobaric specific heat capacity, and isentropic compressibility of (water + 2-methoxyethanol) have been measured at three temperatures (283.15 298.15, and 313.15) K over the entire range of composition. The results were used to compute various thermodynamic excess functions of these mixtures namely: excess molar volume V E m; excess molar isentropic and isothermal derivatives: k E m = -(∂ V E m/∂ p): k E S, m and k E T, m ; excess molar isobaric and isochoric heat capacities C E p, m and C E V, m ; and excess molar isobaric derivative: (∂ V E m/∂ T) p . The corresponding partial molar quantities for 2-methoxyethanol were also computed. The calculated excess and partial molar quantities of (water + 2-methoxyethanol) were compared with those observed earlier in (water + 1,2-ethanediol). The properties of (water + 2-methoxyethanol), and differences in the properties of (water + 2-methoxyethanol) and (water + 1,2-ethanediol), were interpreted along the approaches: the relative ability of the 2-methoxyethanol and 1,2-ethanediol molecules to disrupt fluctuations and hydrogen-bonding connectivity in liquid water, and the consequences of hydrophobic hydration on thermodynamic fluctuations in dilute aqueous systems.
Published Version
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