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Partial molal volumes of ions in organic solvents. IV. Ethylene glycol

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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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Zana, R., Lage, G.A. & Criss, C.M. Partial molal volumes of ions in organic solvents. IV. Ethylene glycol. J Solution Chem 9, 667–682 (1980). https://doi.org/10.1007/BF00645896

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Key words

  • Apparent molal volumes
  • partial molal volumes
  • ionic volumes
  • tetraalkylammonium bromides
  • alkali metal halides
  • ultrasonic vibration potential
  • ethylene glycol