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Nonrandom factor model for the excess Gibbs free energy of weak electrolytes including phosphoric acid |
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| Affiliation: | 1. Chemical Engineering Department, Faculty of Engineering, University of Kurdistan, Sanandaj, Iran;2. Biotechnology Group, Chemical Engineering Department, Faculty of Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran;1. Faculty of Agriculture, Meijo University, Shiogamaguchi 1-501, Tenpaku-ku, Nagoya 468-8502, Japan;2. School of Science and Engineering, Tokyo Denki University, 156-102 Ishizaka, Hatoyama-machi, Hiki-gun, Saitama 350-0394, Japan |
| Abstract: | The Electrolyte Nonrandom Two Liquid-Nonrandom Factor (NRTL-NRF) model of Haghtalab and Vera was modified to determine the excess Gibbs free energy of weak electrolyte systems. The model was applied to the phosphoric acid solution as a weak and complex electrolyte. Its thermodynamic behavior was investigated in a wide range of concentration by choosing an appropriate equilibrium reaction between molecular and ionic species. The model contains four adjustable parameters which were determined using osmotic experimental data. The results of dissociation and of activity coefficients are presented separately. |
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