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Temperature and Concentration Dependence of the Electrical Conductance, Diffusion, and Kinetics Parameters of the Ions in Aqueous Solutions of Sulfuric Acid, Selenic Acid, and Potassium Tellurate

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Abstract

The temperature and concentration dependences of the electrical conductance of aqueous solutions of sulfuric acid, selenic acid, and potassium tellurate were studied. The coefficients of the corresponding empirical equations were determined, and the values of equivalent conductances of the anions were evaluated at infinite dilution at the experimental temperatures. The values of the coefficients in the Fuoss and Onsager equation were evaluated for the three electrolytes at 298 K. The values of the molecular and ionic coefficients of self-diffusion at infinite dilution were calculated in the temperature range 288–318 K. The change of the translational energy Δ E∘tr. of water molecules in the ionic hydration sphere was determined. The number of water molecules participating in the ionic hydration sphere at 298 K and the changes of Gibbs free energy, enthalpy, and entropy of activation of ionic conductance were calculated. The results obtained were interpreted according to the Samoylov’s theory of positive and negative hydration of ions. The differences observed in the temperature dependences of the mentioned parameters were explained in terms of the different radii and hydration numbers of the ions.

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Authors and Affiliations

  1. Department of Physical Chemistry, Assen Zlatarov University, 8010, Bourgas, Bulgaria

    Lyubomir Vlaev & Velyana Georgieva

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  1. Lyubomir Vlaev
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  2. Velyana Georgieva
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Correspondence to Lyubomir Vlaev.

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Vlaev, L., Georgieva, V. Temperature and Concentration Dependence of the Electrical Conductance, Diffusion, and Kinetics Parameters of the Ions in Aqueous Solutions of Sulfuric Acid, Selenic Acid, and Potassium Tellurate. J Solution Chem 34, 961–980 (2005). https://doi.org/10.1007/s10953-005-6259-2

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  • DOI: https://doi.org/10.1007/s10953-005-6259-2

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