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  • 1975-1979  (3)
  • transference numbers  (2)
  • Dielectric constant  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Structural considerations from dielectric measurements on the aliphatic alcohols (1975)
    Springer
    Journal of solution chemistry 4 (1975), S. 299-310 
    Details
    ISSN: 1572-8927
    Keywords: Dielectric constant ; ethanol ; high pressure ; Kirkwoodg K factors ; liquid association ; methanol ; n-propanol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Precise static dielectric constants are reported for methanol, ethanol, andn-propanol at 10,25, and 40° C and at pressures up to 3 kbar. The measurements were carried out by a low-frequency bridge method using a threeterminal, all-glass cell. An uncertainty of 0.05% is claimed for the data. The results are compared to data from previous investigations, whith the agreement in the absolute magnitude poor but the agreement in the pressure coefficient reasonable in most cases. The data are analyzed in terms of the Kirkwood correlation factorg K as obtained from the Fröhlich equation. In all cases, theg K factor decreases with increased pressure. The problems involved in calculating this factor from the experimental data are discussed, and it is shown that the trends ing K are very dependent upon the assumptions made in isolating the liquid dipole moment from its gas-phase value. This fact also indicates that an interpretation of theg K values in terms of stepwise association of correlation dipoles is premature at this time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650388
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The temperature coefficient of conductance for the alkali metal, halide, tetraalkylammonium, halate, and perhalate ions in D2O (1975)
    Springer
    Journal of solution chemistry 4 (1975), S. 745-762 
    Details
    ISSN: 1572-8927
    Keywords: KCl ; KBr ; KClO3 ; KBrO3 ; KlO3 ; KClO4 ; KlO4 ; D2O ; conductance ; transference numbers ; aqueous solutions ; structural effects ; solvent isotope effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Precise limiting ionic conductance data are reported for the first time for the alkali metal and tetraalkylammonium ions in D2O at 10°C as well as similar data for the halate and perhalate ions in D2O and H2O at 10 and 25°C. Precise transference numbers by the moving-boundary method are also reported for KBr in D2O at 10°C and, as a check on earlier work, for KCl in D2O at 25°C. In general, the structural properties of the ions, as reflected in the temperature coefficient of the limiting ionic conductances, are enhanced in D2O compared to H2O, although the differences are often small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650531
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Solvent structure in aqueous mixtures. III. Ionic conductances in ethanol-water mixtures at 10 and 25°C (1976)
    Springer
    Journal of solution chemistry 5 (1976), S. 57-76 
    Details
    ISSN: 1572-8927
    Keywords: Viscosity ; dielectric constants ; transference numbers ; conductance ; ethanol-water mixtures ; temperature coefficients ; alkalimetal halides ; tetraalkylammonium bromides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Viscosities at 10 and 25°C and dielectric constants at 10°C are reported for ethanol-water mixtures. Precise transference numbers for KBr at 10°C were determined by the moving-boundary method for five solvent mixtures containing up to 20 mole % ethanol. Conductance measurements for the alkali halides and tetraalkylammonium bromides were carried out across the complete range of solvent composition at 25°C, but for the water-rich region only at 10°C. The resulting limiting ionic Walden products confirmed the conclusions arrived at from earlier measurements. The maxima occurring in the water-rich region cannot be attributed solely to a structure-breaking effect owing to the ionic size dependence which is in the wrong direction. The tetraalkylammonium ions in these mixtures do not exhibit an enhanced hydrophobic effect, nor do they appear to enhance structure of any kind. Rather, the addition of alcohol to an aqueous Bu4N+ solution merely reduces the magnitude of the hydrophobic effect, as illustrated by a steadily increasing Walden product in the water-rich region. A decrease in temperature has no effect on the Walden product for the Bu4N+ ion but increases the magnitude of the maxima for the alkali-metal and halide ions. These maxima are attributed to sorting of the solvent components by the ionic charge, due to an acid-base type interaction, so that the proportion of water in the ionic cospheres is greater than in the bulk solvents. The sorting effect is shown to be temperature independent. The oxyanions are shown to exhibit a behavior in these mixtures that cannot be identified at this time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647181
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    Paper (German National Licenses)
    Fulltext
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