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Viscosity of Aqueous Solutions of Lithium, Sodium, Potassium, Rubidium and Caesium Cyclohexylsulfamates from 293.15 to 323.15 K

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Abstract

The viscosities of aqueous solutions of lithium, sodium, potassium, rubidium and caesium cyclohexylsulfamates were measured at 293.15, 298.15, 303.15, 313.15 and 323.15 K. The relative viscosity data were analyzed and interpreted in terms of the Kaminsky equation, η r=1+Ac 1/2+Bc+Dc 2. The viscosity A-coefficient was calculated from the Falkenhagen-Dole theory. The viscosity B-coefficients are positive and relatively large. Their temperature coefficient ∂ B/∂ T is negative or near zero for lithium and sodium salts whereas for potassium, rubidium and caesium salts it is positive. The viscosity D-coefficient is positive. This was explained by the size of the ions, structural solute–solute interactions, hydrodynamic effect, and by higher terms of the long-range Debye-Hückel type of forces. From the viscosity B-coefficients the thermodynamic functions of activation of viscous flow were calculated. The limiting partial molar Gibbs energy of activation of viscous flow of the solute was divided into contributions due to solvent molecules and the solute in the transition state. The activation energy of the solvent molecules was calculated using the limiting Gibbs energy of activation for the conductance of the solute ions. The activation energy of the solvent molecules was then discussed in terms of the nature of the alkali-metal ions and their influence on the structure of water. The limiting activation entropy and enthalpy of the solute for activation of viscous flow were interpreted by ion-solvent bond formation or breaking in the transition state of the solvent. The hydration numbers of the investigated electrolytes were calculated from the specific viscosity of the solutions.

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Authors and Affiliations

  1. Department of Food Technology, Biotechnical Faculty, University of Ljubljana, SI-1000, Ljubljana, Slovenia

    Jaka Horvat, Cveto Klofutar & Darja Rudan-Tasic

  2. Faculty of Chemistry and Chemical Technology, University of Ljubljana, SI-1000, Ljubljana, Slovenia

    Marija Bešter-Rogač

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  1. Jaka Horvat
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  2. Marija Bešter-Rogač
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  3. Cveto Klofutar
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  4. Darja Rudan-Tasic
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Correspondence to Darja Rudan-Tasic.

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Horvat, J., Bešter-Rogač, M., Klofutar, C. et al. Viscosity of Aqueous Solutions of Lithium, Sodium, Potassium, Rubidium and Caesium Cyclohexylsulfamates from 293.15 to 323.15 K. J Solution Chem 37, 1329–1342 (2008). https://doi.org/10.1007/s10953-008-9311-1

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