Partial molal volumes of ions in organic solvents. IV. Ethylene glycol |
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Authors: | R Zana G A Lage C M Criss |
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Institution: | (1) Centre de Recherches sur les Macromolecules, C.N.R.S., 67083 Strasbourg-Cedex;(2) Present address: Cordis-Dow Corporation, 14600 NW 60th Ave., 33014 Miami, Florida;(3) Department of Chemistry, University of Miami, 33146 Coral Gables, Florida |
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Abstract: | Apparent molal volumes have been measured for several electrolytes in ethylene glycol (EG) and the standard state partial molal volumes, V2°, evaluated. Ultrasonic vibration potentials (uvp) have also been measured for most of the alkali metal halides in EG, and these employed to evaluate ionic partial molal volumes, V° (ion). The results show unambiguously that the uvp is essentially independent of solvent viscosity. The V2° data have also been divided into ionic components by four other techniques including, the method of Mukerjee, the use of Ph4AsBPh4, the correspondence method and an extrapolation of V2° for a series of tetraalkylammonium bromides as a funtion of cation molecular weight. With the exception of the latter technique, all methods used give 30±2 cm3-mol–1 for V° (ion), although the uvp leads to the largest value for V° (ion). The divisions have been analyzed also with the aid of Hepler's equation, and the results suggest that the uvp method gives a more accurate division and that the EG dipole is more hindered than the dipole in ethanol. |
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Keywords: | Apparent molal volumes partial molal volumes ionic volumes tetraalkylammonium bromides alkali metal halides ultrasonic vibration potential ethylene glycol |
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