Electric Transport Phenomena in Mixed Electrolyte Solutions. II. Experimental Examples

Autor: E. O. Timmermann
Rok vydání: 1979
Předmět:
Zdroj: Berichte der Bunsengesellschaft für physikalische Chemie. 83:263-270
ISSN: 0005-9021
DOI: 10.1002/bbpc.19790830314
Popis: The description of the electric transport quantities in mixed electrolyte solutions given in Part I is illustrated with experimental data for several systems. The use of the excess conductivity functions is shown on the basis of Longsworth's data for HCl(1)-KCl(2)-H2O at c = 0.1 mol dm−3. The ionic conductivities of the three ion constituents are non-linear with respect to the equivalent fraction y,1. A quadratic term has to be added to reproduce the experimental data. The excess conductivity AE at constant total equivalent concentration for NaCl(1)—KCl(2)—H2O (molality scale) and NaCl(1)—MgCl2(2)—H2O (molarity scale) responds to the simple and symmetric formula over a wide range of concentration. A correlation between the constant A and the difference of the equivalent conductivities of the corresponding binary solutions for nine ternary mixtures of uni-univalent electrolytes is discussed. Within the experimental error and with the few experimental data available for four alkali-metal chloride mixtures the limiting law of the transport number is confirmed. Limiting ionic conductivities of the trace ion constituents are calculated and compared with their ionic conductivities in the binary solutions and with the values predicted by Van Rysselbergh's approximation. The latter are consistent with the experimental results.
Databáze: OpenAIRE
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