V曲线和Δ2E/ΔV2-曲线），进行了具体作图计算处理。引导学生比较了手动电位滴定法、自动电位滴定法和指示剂法3类方法的滴定结果，并对其结果进行了深刻的分析。将确定终点体积的方法连成一个体系，可以帮助学生深刻理解方法原理和计算处理方法，通过比较可以加深理解滴定剂终点体积确定方法的选择。"/>
V curve and Δ2E/ΔV2- curve) have been described in order to guide students to compare and analyze the titration results of manual potentiometric titration method, automatic potentiometric titration method and indicator method. Considering methods for dmetermining titrant volume of titration end point as a system could help the students to understand principles and calculation methods, and comparing the three methods could deepen students' understanding of the selection of titration method."/>
Comparison of Methods to Determine Titrant Volume of Titration End Point
1. Hunan Nonferrous Metals Vocational and Technical College, Zhuzhou 412006, China;
2. College of Environment & Civil Engineering, Chengdu University of Technology, Chengdu 610059, China
Abstract Determine titrant volume of titration end point is the core of titration analysis work. Taking experiment of ferrous potassium dichromate titration as example, three kinds of manual potentiometric titration method to determine the titrant volume of titration end point (E-V curve method, ΔE/ΔV-V curve and Δ2E/ΔV2- curve) have been described in order to guide students to compare and analyze the titration results of manual potentiometric titration method, automatic potentiometric titration method and indicator method. Considering methods for dmetermining titrant volume of titration end point as a system could help the students to understand principles and calculation methods, and comparing the three methods could deepen students' understanding of the selection of titration method.
ZHOU Yan-Feng, ZHONG Min, CHEN Zhi-Xun, WU Hui-Ling. Comparison of Methods to Determine Titrant Volume of Titration End Point[J]. Chinese Journal of Chemical Education, 2017, 38(8): 39-43.
曲线），进行了具体作图计算处理。引导学生比较了手动电位滴定法、自动电位滴定法和指示剂法3类方法的滴定结果，并对其结果进行了深刻的分析。将确定终点体积的方法连成一个体系，可以帮助学生深刻理解方法原理和计算处理方法，通过比较可以加深理解滴定剂终点体积确定方法的选择。"/>
V curve and Δ2E/ΔV2-.jpg){kind=small}
curve) have been described in order to guide students to compare and analyze the titration results of manual potentiometric titration method, automatic potentiometric titration method and indicator method. Considering methods for dmetermining titrant volume of titration end point as a system could help the students to understand principles and calculation methods, and comparing the three methods could deepen students' understanding of the selection of titration method."/>