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  • EMF  (1)
  • Gurney cosphere  (1)
  • 1
    Digitale Medien
    Digitale Medien
    A comparison of ion-solvent interactions evaluated from both emf and conductance data for HCl in aqueous solvent mixtures (1994)
    Springer
    Journal of solution chemistry 23 (1994), S. 703-709 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Hydrochloric acid ; water-dioxane ; water-tetrahydrofuran ; water-dimethoxyethane ; conductance ; EMF ; association constants ; short range non-coulombic interactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Available emf data for HCl in water-dioxane, water-tetrahydrofuran, and water-dimethoxyethane at 25°C have been analyzed using models based on similar levels of approximation as was used previously for conductance data. The emf data were evaluated in terms of standard cell potentials, apparent distances of closest approach, association constants and a Gibbs energy term attributed to non-coulombic ion-solvent interaction. Although emf and conductance data give essentially the same results it is clear that the conductance method, with its much greater precision, is superior for this type of analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00972716
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  • 2
    Digitale Medien
    Digitale Medien
    A conductance investigation of HCl in aqueous solutions of tetrahydrofuran, dimethoxyethane and dioxane (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 1211-1224 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Hydrochloric acid ; water-tetrahydrofuran ; water-dioxane ; water-dimethoxyethane ; conductance ; association constants ; proton mobility ; Gurney cosphere
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Conductance of dilute solutions of HCl in water-tetrahydrofuran (THF), water-dioxane and water-dimethoxyethane (DME) were measured and the data processed using the Justice-Ebeling equation to evaluate the limiting conductance ΛO, the association constant KA and the apparent distance of closest approach a'. The Friedman-Rasaiah Gurney cosphere overlap term d+−/kT was calculated from a' values and illustrates the different solvation pattern of dioxane compared to that found for THF and DME. It would appear that dioxane can solvate cations more strongly due to its ability to form a boat configuration around a cation. The association constants are reasonably reproduced by the Bjerrum equation using realistic molecular dimensions of the ions involved for the distance of closest approach. The limiting conductance in the mixtures illustrates clearly the different mechanism for proton conductance compared to that for the cesium ion. The dielectric constants, viscosities and densities of the solvent mixtures were measured and are reported. The lowest dielectric constant for each type of solvent mixture was about 10.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00652546
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