大学化学2024，Vol.39Issue(5)：193-200,8.DOI:10.3866/PKU.DXHX202311021
界面移动法测定离子迁移数实验的改进
Improvement for Measuring Transference Numbers of Ions by Moving-Boundary Method
摘要
Abstract
The apparatus for moving-boundary method is upgraded by digital technique.The conductivity-time curve is measured,and the moving velocity of the boundary through two pairs of conductive electrodes can be determined precisely and objectively.This method eliminates the subjective deviation from manual observation.No indicator is needed to mark the boundary,and the problem of unobservable boundary at low concentration is therefore solved.The experimental object is also extended from traditional acidic electrolyte solution(e.g.,aqueous HCl)to neutral electrolyte solution(e.g.,aqueous NaCl,KCl,etc.).In the range of experimental concentrations(approx.0.01 mol∙L-1 to 0.1 mol∙L-1),the transference number of H+can be obtained with a reasonable deviation(0.8230-0.8350)by this method.The improved apparatus can be used to determine the transference numbers and mobilities of electrolytes,which provides a new way for physical chemistry experiment teaching.关键词
实验技术与仪器改进/界面移动法/电导率/离子迁移数/离子电迁移率Key words
Improvement for experimental technique and apparatus/Moving-boundary method/Conductivity/Transference number/Mobility分类
社会科学引用本文复制引用
唐嘉屿,庞继川,肖少华,许新华,吴梅芬..界面移动法测定离子迁移数实验的改进[J].大学化学,2024,39(5):193-200,8.基金项目
同济大学第18期实验教学改革专项基金项目(1380104132) （1380104132）
