摘要
水中铬含量测定实验对实验者操作技能要求很高。物理专业学生没有接受过基础化学实验训练,难以规范地使用多种化学分析仪器,准确地检测出溶液中铬离子浓度比较困难,学习效果不理想。对传统的教学方案进行了调整,适当地降低了实验的操作难度,用移液枪替代微量滴定管,增加平行实验次数,并且用计算机辅助分析实验数据。改进的实验方法帮助学生更好地理解实验的要点,加深对化学知识的理解,提高了实验的训练效果。
The experiment of “determination of chromium in water” requires high operation skills for experimenters. The physics major students do not receive basic chemistry experiment trainings and the standard use of a variety of chemical analysis instruments. 1 t is difficult for them to measure the chromi-um ion concentration in solution,and so the study is not effective. We adjusted the traditional teaching scheme,including the reduction the difficulty of the experiment,replacing a pipette with a microburet, increasing the number of parallel experiments and using computer software Origin to analyze the experi-mental data. The improved experimental methods help students better understand the main points of the experiment,deepen their understanding of chemistry and improved the training effect of experiments.
作者
谭大志
郝思媛
宿艳
张玲玉
TAN Da- zhi;HAO Si- yuan;SU Yan;ZHANG Ling-yu(Experiment Center of Chemistry,Dalian University of Technology,Dalian 116023, China)
出处
《实验室科学》
2018年第2期35-37,共3页
Laboratory Science
基金
大连理工大学教学改革重点项目(项目编号:ZD2016004)