Thermodynamic Properties of an Aqueous Solution of Tetraethylene Glycol Diethyl Ether

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Abstract
The excess Gibbs energy of mixing, GE; the excess enthalpy of mixing, HE, and the excess volume of the mixing, VE, of the tetraethylene glycol diethyl ether+water system have been measured as functions of the composition at 25°C. The GE, which has been determined through the isopiestic measurement of the water activity, is positive over the entire range of composition and has its maximum at 40 mol% ether. As has been found for analogous systems, the s-curve of HE is again found; that is, HE is large and negative (exothermic) in the water-rich region and positive (endothermic) in the ether-rich region. The VE is negative over the whole range of composition and has a minimum at 23 mol% ether. These results are discussed in the light of the structural modifications of water in the immediate neighborhood of the ether molecule.

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