界面移动法测定氯化氢水溶液的离子迁移数  

Transference numbers of aqueous hydrochloric acid by the moving boundary method

作　　者：吴梅芬[1] 王晓岗 许新华[1] WU Meifen;WANG Xiaogang;XU Xinhua(School of Chemical Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学化学科学与工程学院,上海200092

出　　处：《实验室科学》2023年第5期56-59,65,共5页Laboratory Science

基　　金：同济大学第十五期实验教学改革专项基金(项目编号:1380104121)。

摘　　要：用铜电极代替有毒的镉电极,以甲基紫为指示剂,采用恒电流移动界面法测定了一系列不同浓度氯化氢水溶液的离子迁移数。对测定的迁移数与溶液浓度的函数关系,用两种方法进行了处理:根据Longsworth方程进行数值计算,然后线性拟合;或者根据Debye-Hückel-Onsager方程,用图解法。在数据计算和外推至零浓度极限条件时,这两种方法得到了一致的结果。The transference numbers of H^(+)and Cl^(-)in aqueous solutions of hydrochloric acid with different concentrations were determined by the moving boundary method under constant current.Copper was used as anode,instead of the poisonous cadmium.The indicator was a solution of 0.1%(wt)methyl violet.The measured transference numbers as a function of the concentration was discussed in two ways:calculated numerically by Longsworth's equation and then linear fitting,or solved graphically based on Debye-Hückel-Onsager equation.For interpolation and for extrapolation to zero concentration,the results from these two ways were in consistence with each other.

关 键 词：界面移动法 迁移数 无限稀释 

分 类 号：O64[理学—物理化学] O6-3[理学—化学]