A new model for the activity coefficients of individual ions in aqueous electrolyte solutions |
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| Institution: | 1. Department of Biotechnology Engineering, Malek ashtar University of Technology, Tehran, Iran;2. Department of Chemistry, Islamic Azad University, Shahrood Branch, Shahrood, Iran;1. Alya Technology & Innovation, Centre de Promoció Empresarial, C/ Tres Creus 236, 08203, Sabadell, Barcelona, Spain;2. IQS School of Engineering, Universitat Ramon Llull, Via Augusta 390, 08017, Barcelona, Spain;1. Laboratory of Thermodynamics, Department of Biochemical and Chemical Engineering, Technische Universität Dortmund, Emil-Figge-Str. 70, 44227 Dortmund, Germany;2. Institute for Physical and Theoretical Chemistry, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany;1. Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, Lviv 79011, Ukraine;2. Department of Chemical and Biochemical Engineering and Multiscale Modeling and Simulation Center, Vanderbilt University, Nashville, TN 37235-1604, USA |
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| Abstract: | In this study, the individual ion activity coefficient in an aqueous solution is modeled with a new model. This model contains two physical significant ionic parameters regarding the ionic solvation and the closest distance of approach between ions in a solution. The present model was evaluated by the estimation of the individual activity coefficients of the ions of thirty electrolytes in aqueous solutions. The results showed that this model suitably predicts the individual ion activity coefficients in aqueous two-electrolyte solutions consisting of the binary pairs of electrolytes of NaCl, KCl, KBr and CaCl2 in a temperature range from 298.15 to 243.15 K. The results by this model were compared to the literature values. The average absolute relative deviations of vapor pressures showed acceptable agreement between experimental data and the results of this model. |
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