偏硼酸锂溶液物种分布和物化性质

Chemical Species Distribution and Physicochemical Properties in Aqueous Lithium Metaborate

中文关键词:  偏硼酸锂  物种分布  转化过程  密度  电导

英文关键词:Lithium metaborate  Species distribution  Inter-conversion process  Density  Conductivity

中文摘要:

      测量了不同浓度LiBO2溶液分别在298.15和323.15 K的密度、电导和pH,通过测得的pH和硼酸根离子化学平衡常数计算得到溶液中硼酸根离子的物种分布。根据获得的物种分布结果,推测溶液中各硼酸根离子之间的相互转化过程,并分别用偏摩尔体积公式和Onsager方程对溶液偏摩尔体积及摩尔电导率进行计算并拟合。对计算得到偏摩尔体积值和极限摩尔电导率值与文献报道的数据进行对比,计算结果与文献报道值吻合较好。

英文摘要:

      The density,conductivity and pH of the lithium metaborate aqueous in different concentration have been measured at 298. 15 and 323.15 K, respectively. The authors calculated the chemical species distributions from pH and the chemical equilibrium constants of polyborates. According to the chemical species distribution, the inter-conversion process among all the borate anions have been inferred in the present paper, the partial molar volume and the empirical coefficients in Onsager＇ s equation of molar con- ductivity were calculated and fitted. Comparing with the literature, the caculated partial molar volume and the limiting molar conductivity were in good agreement.