应用化学2024，Vol.41Issue(6)：906-911,6.DOI:10.19894/j.issn.1000-0518.230371
物理化学实验教学细节探讨
Discussion on Details of Physical Chemistry Experiment Teaching
摘要
Abstract
The determination of molar mass by the freezing-point depression method is one of the classical experiments in physical chemistry.Given the existing materials and literature of physical chemistry on some content in regard to freezing point determination is not detailed enough,such as the cause of the undercooling phenomenon is short of a comprehensive,in-depth explanation;the determination of the approximate freezing point of pure solvent needs to observe'when there is solid precipitation',where does the precipitation of solid appear firstly in the glass tube?What is the morphology of the precipitated solid?The existence of these problems will cause students trouble when operating experiments.Aiming at the above problems,the whole process of solvent solidification was filmed through experimental innovation in this paper,the specific position and morphology of solid precipitation were analyzed,and it can be concluded that it was appropriate for students to observe the solid to precipitate flocculent preferentially from the glass tube bottom during experimental operation.Through the freezing-point depression method,the details of solvent solid precipitation were observed,the molecular weight of the solute was calculated and analyzed,and reliable experimental results were obtained.In this paper,the operation details of the freezing-point depression method are deeply studied and discussed,which can effectively avoid or eliminate the problems in the experimental operation and greatly improve the experimental effect on students.关键词
凝固点/凝固点降低法/摩尔质量/物理化学/实验教学Key words
Freezing point/Freezing-point depression method/Molar mass/Physical chemistry/Experimental teaching分类
化学化工引用本文复制引用
王金权,肖新华,季晶玲,石明昊,郭晶,吴彩金,徐海青,孙浩,孔亚洲..物理化学实验教学细节探讨[J].应用化学,2024,41(6):906-911,6.基金项目
江苏省高等教育教改研究课题(No.2019JSJG245)、淮阴工学院教改课题重点项目(No.JGKTZD004)、淮阴工学院教改课题项目(No.JGKT202117)和江苏高校品牌专业建设工程二期项目(化学工程与工艺)资助 Surported by Jiangsu Province Higher Education Teaching Reform Research Project(No.2019JSJG245),Huaiyin Institute of Technology Teaching Reform Key Project(No.JGKTZD004),Huaiyin Institute of Technology Teaching Reform Project(No.JGKT202117)and Jiangsu University Brand Major Construction Project Ⅱ(Chemical Engineering And Technology) （No.2019JSJG245）
