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碳酸铷、硼酸化学计量比混合,蒸发溶液,直至五硼酸铷RbB_5O_8·4H_2O晶体析出。经粉末X射线衍射、拉曼光谱、热重/微商热重/差示扫描量热(TG/DTG/DSC)、原子吸收光谱等实验方法,确定其化学组成及结构,298.15、333.15K时测量溶液的物理化学性质(密度、电导、pH),并与经验方程进行拟合,研究五硼酸铷溶液的物化性质随浓度、温度的变化规律。根据文献报道的平衡常数、实验测量的p H数据,采用牛顿迭代法进一步探讨了五硼酸铷溶液中主要存在的硼酸根离子物种分布规律。
Rubidium carbonate, boric acid stoichiometric mixture, the solution was evaporated until rubidium pentaborobenzene RbB_5O_8 · 4H_2O crystals were precipitated. The chemical composition and structure were determined by powder X-ray diffraction, Raman spectroscopy, TG / DTG / DSC and atomic absorption spectroscopy. The chemical composition and structure were determined at 298.15 and 333.15K The physicochemical properties (density, conductance, pH) of the solution were measured and fitted with empirical equations to study the changes of the physical and chemical properties of the rubidium pentaborate solution with concentration and temperature. According to the reported equilibrium constants and experimentally measured p H data, Newton’s iterative method was used to further explore the distribution of the main borate ion species in rubidium pentaborate solution.