Journal of Chemical Thermodynamics, Vol.43, No.1, 58-62, 2011
Phenomenon of "negative partial molar expansibility" of water in tetrahydrofuran How plausible is it? Discussion on the paper "Volumetric properties on the (tetrahydrofuran plus water) and (tetra-n-butylammonium bromide plus water) systems Experimental measurements and correlations" by Veronica Belandria, Ammir H Mohammadi and Dominique Richon [J Chem Thermodyn 41 (2009) 1382-1386]
In order to answer the question is a solute water negatively expansible in tetrahydrofuran or not (?) a comparative analysis of own and literature data on the temperature-dependent partial volumes at the infinite dilution of water isotopologues in tetrahydrofuran have been carried out Used for computing the limiting partial (apparent) volumes of water isotopologues densities of H2O and D2O solutions in the solvent studied with the solute mole fractions ranging up to similar to 0 043 were measured with an error of 15 10(-5) cm(3) mol(-1) at (278 15 288 15 298 15 308 15 and 318 15) K and atmospheric pressure using a vibrating tube densimeter It has been shown that the partial molar volume of H2O or D2O at infinite dilution increases with rising temperature that is the isotopically distinguishable solutions of water in tetrahydrofuran do not have the unusual structure-packing behavior being characteristic of the water-containing system with the so-called phenomenon of negative partial molar expansibility (C) 2010 Elsevier Ltd All rights reserved
Keywords:Partial molar volumes and expansibilities at infinite dilution;Ordinary and heavy water;Tetrahydrofuran;Solute Isotope effects