Thermodynamics of NaOH(aq) in hydrothermal solutions |
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| Institution: | 2. Institute of Crystallography of RAS, 59, Leninskiy Ave., 119333 Moscow, Russia;1. Centre de Recherches sur les Macromoléculés Végétales (CERMAV, UPR-CNRS 5301), Université Grenoble Alpes, BP 53, F-38041 Grenoble Cedex 9, France;2. Department of Materials Chemistry, Asahikawa National College of Technology, Asahikawa 071-8142, Japan;3. Departamento de Ciências Farmacêuticas, Universidade Federal de Santa Catarina, Florianópolis 88040-900, Brazil;1. School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China;2. Key Laboratory of Chemical Metallurgy Engineering of Liaoning Province, Anshan 114051, China;3. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;1. School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300, Nibong Tebal, Penang, Malaysia;2. Forestry and Wood Technology Discipline, Khulna University, Khulna, 9208, Bangladesh;3. Chemical Engineering Department, Engineering College, Baghdad University, P.O. Box 47024, Aljadria, Baghdad, Iraq;4. Department of Chemistry, Govt. Degree College, Anantnag, 192102, Jammu & Kashmir, India;5. Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia |
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| Abstract: | Apparent molar volumes and osmotic coefficients of NaOH solutions, calculated from critically evaluated literature data on volumes and vapor pressures, were used to fit the Pitzer equations to yield ion-interaction parameters as a function of temperature and pressure. These parameters allow the calculation of osmotic and activity coefficients from 0–350°C, saturation pressure to about 400 bars and 0–10 molal NaOH, and volumetric properties at saturation pressure over the same temperature and concentration range. Because the parameters for osmotic and activity coefficients above 300°C are based on less precise data, and because of possible ion-pairing above this temperature, calculated values above 300°C are considered only as best estimates available at this time. Partial molar volumes at infinite dilution calculated for NaOH are combined with literature data for NaCl, HCl, and H2O to yield the pressure dependence of the ionization of water to 200°C, and are also combined with the potentiometric data of Sweeton et al. (1974) on the ionization of water to calculate the infinitely dilute partial molar volume of HCl to 300°C. Specific volumes of NaOH solutions at saturation pressure and up to 350°C are also calculated and tabulated. |
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