摘要
终点误差是滴定分析的核心内容之一,现行教材中众多导出公式致使终点误差的计算过于复杂。本文提出了一种通用高效的计算策略,统一了酸碱滴定、配位滴定以及氧化-还原滴定的终点误差计算;此外,还将准确滴定判别统一到终点误差的计算中。各种实例显示,这种策略不要求记忆任何导出公式即可完成计算,而且运算强度低。公式的统一性以及运算的便捷性极大地简化了终点误差的计算,在教学中能够显著减轻学生的记忆和运算负担,提升学习兴趣,从而能够将学习重点放在滴定体系的分析和处理上。本研究作为当前形势下分析化学教学改革的一个尝试,对传统课程内容进行优化,去冗存精,使其简明凝练,重点突出,定量分析的主旨更加明晰。
The titration error plays a key role in quantitative chemical analysis.The computation of titration error in most current textbooks is so complicated that the titration error becomes an overwhelming obstacle to the study.Based on the concept of titration error,a universal strategy was proposed in this paper.With this strategy,the titration errors of the acid-base titration,the EDTA titration and the redox titration can be computed in the same way.The computation is not only highly efficient,but also free of any derived formulae.This strategy can also be employed to determine the feasibility of an accurate titration.This determination in traditional textbooks is carried out with several conditions that put the burden of memorization on students.The presented strategy shows several advantages over the classical formula-oriented solution,including straightforwardness,high efficiency and memorization-free.These advantages not only relieve the students from the severe burden of memorizing many formulae in the traditional textbook,but also provide the lecturers with more class hours for the in-depth knowledge on the quantitative chemical analysis.This research is a part of a project designed to reform the curriculum of analytical chemistry.
出处
《化学通报》
CAS
CSCD
北大核心
2012年第10期952-956,共5页
Chemistry
基金
2010年安徽省高等学校省级教学质量与教学改革工程项目资助
关键词
定量化学分析
滴定
终点误差
Quantitative Chemical Analysis
Titration
Titration Error
