Determination of thermodynamic properties of aqueous mixtures of RbCl and Rb2SO4 by the EMF method at T=298.15 K |
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| Institution: | 1. Department of Chemistry, Lanzhou University, Lanzhou 730000, PR China;2. Department of Chemical Engineering, Henan University of Science and Technology, Luoyang 471039, PR China;3. Institute of Salt Lakes, Chinese Academy of Sciences, Xi’an 710043, PR China;1. Institute of Catalysis and Inorganic Chemistry, Azerbaijan National Academy of Science, Baku, Azerbaijan;2. Ganja State University, Chemistry Department, Ganja, Azerbaijan;3. Azerbaijan State Oil and Industry University, Azadlig Ave., AZ 1010, Baku, Azerbaijan;4. Institute of Physics, Azerbaijian National Academy of Science, AZ 1143, Baku, Azerbaijan;1. Ganja State University, Chemistry Department, Ganja, Azerbaijan;2. Institute of Catalysis and Inorganic Chemistry, Azerbaijan National Academy of Science, Baku, Azerbaijan;3. Institute of Physics, Azerbaijan National Academy of Science, Baku, Azerbaijan;1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, PR China;2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, PR China;3. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, PR China;1. Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi’an, Shaanxi 710062, PR China;2. School of Education, Shaanxi Normal University, Xi’an, Shaanxi 710062, PR China |
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| Abstract: | The thermodynamic properties, including activity coefficients, osmotic coefficients and excess Gibbs free energy for RbCl and Rb2SO4 aqueous mixtures at T=298.15 K and in 0.01 mol · kg−1 to 5 mol · kg−1 ionic strength, were determined by emf measurements. The Rb–ISE and Ag–AgCl electrodes used in this work were prepared in our laboratory and had a reasonably good Nernst response. The experimental data were fitted by using the Harned rule and Pitzer model. The Harned coefficients and the Pitzer binary and ternary interaction parameters for the system have been evaluated. The experimental results obey the Harned rule. The Pitzer model can be used to describe this aqueous system satisfactorily. |
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