以助教的视角看定量分析化学实验的教与学

doi:10.3866/PKU.DXHX202106053

Abstract

Abstract:

The teaching quality of quantitative analytical chemistry laboratory course is not only related to students' understanding of analytical chemistry, but also has a profound impact on their basic laboratory skill training. In this paper, from the perspective of a teaching assistant who is both a student and a teacher, we focus on several factors that affect the teaching quality of quantitative analysis chemistry laboratory course, and try to find a plan to improve the teaching quality, so as to provide reference for quantitative analytical chemistry laboratory course teaching.

Key words: Quantitative analytical chemistry laboratory, Laboratory teaching, Teaching assistant

Junjie Liu, Zhiwei Zhu. Teaching and Learning of Quantitative Analytical Chemistry Laboratory from the Perspective of Teaching Assistant[J].University Chemistry, 2021, 36(9): 2106053.

实验名称	错误描述
经典滴定与电位滴定	洗涤不够，转移不充分
	定容后未充分摇匀，搅拌不充分
	电位滴定时挂在烧杯内壁的溶液忘记清洗下去
	滴定间隔太大
	转移称量物时忘记变换把控称量瓶的手势
	以移液管移取溶液时伸入溶液过深
	以移液管移放溶液时尖端未靠壁
光度法	润湿碳酸锂试样时加水过量
	定容时过标线
	滴定操作错误
	转移样品溶液时洗涤没有少量多次(导致加入水太多)
	忘记加入关键试剂(如缓冲试剂或显色剂)

实验名称	问题
经典滴定与电位滴定	能否在电位滴定时加入指示剂？
	为什么先要在千分之一天平上粗称后在在万分之一天平上称量草酸样品？
	电位滴定时搅拌速率的问题以及什么时候需要搅拌？
	二阶微分不可导怎么办？
光度法	处理试样溶液时为什么要将溶液蒸干？
	pH探究实验时为什么需要加热？
	pH探究实验时有哪些pH很难达到？
	为什么以试剂空白为参比？
	为什么络合物的吸光度与波长有关？

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Teaching and Learning of Quantitative Analytical Chemistry Laboratory from the Perspective of Teaching Assistant

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