Calculating models of mass action concentrations for structural units orion couples in RbCl-H₂O binary system and RbCl-RbNO₃-H₂O ternary system

来源期刊：中国有色金属学报(英文版)2010年第6期

论文作者：郭汉杰 杨学民 赵伟洁

文章页码：1112 - 1120

Key words：mass action concentration; activity; ion and molecule coexistence theory; RbCl-H₂O; RbCl-RbNO₃-H₂O; structural unit; ion couple

Abstract: Thermodynamic models of calculating mass action concentrations for structural units or ion couples in RbCl-H₂O binary and RbCl-RbNO₃-H₂O ternary strong electrolyte aqueous solutions were developed based on the ion and molecule coexistence theory at 298.15 K. A transformation coefficient is needed to compare the calculated mass action concentration and the reported activity because they are obtained at different standard states and concentration units. The results show that the transformation coefficients between the calculated mass action concentrations and the reported activities of the same structural units or ion couples in RbCl-H₂O binary and RbCl-RbNO₃-H₂O ternary strong electrolyte aqueous solutions change in a very narrow range. The transformed mass action concentrations of structural units or ion couples in RbCl-H₂O binary system are in good agreement with the reported activities. The transformed mass action concentrations of RbCl and RbNO₃ in RbCl-RbNO₃-H₂O ternary solution are also in good agreement with the reported activities, a_RbCl and , with different total ionic strengths as 0.01, 0.05, 0.1, 0.5, 1.0, 1.5, 2.0, 3.0 and 3.5 mol/kg, respectively. All those results mean the developed thermodynamic model of strong electrolyte aqueous solutions can reflect structural characteristics of RbCl-H₂O binary and RbCl-RbNO₃-H₂O ternary strong electrolyte aqueous solutions and the mass action concentration also strictly follows the mass action law.