滴定分析的终点误差随待测物浓度及反应平衡常数单调变化之商榷  

Questioning on Monotonous Varying of Absolute Value of End-Point Error with Reaction Equilibrium Constant and Concentration of the Analyte in Titrations

作　　者：岳宣峰[1] 张茹梅 马佳睿 谢遵园[1] 章书怡 肖雨晴 王怡华 张延妮[2] Yue Xuanfeng;Zhang Rumei;Ma Jiarui;Xie Zunyuan;Zhang Shuyi;Xiao Yuqing;Wang Yihua;Zhang Yanni(Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province,School of Chemistry and Chemical Engineering of Shaanxi Normal University,Xi’an,710062;Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry,School of Life Science of Shaanxi,Normal University,Xi’an,710062)

机构地区：[1]陕西省生命分析化学重点实验室、陕西师范大学化学化工学院,西安710062 [2]药用资源与天然药物化学教育部重点实验室、陕西师范大学生命科学学院,西安710062

出　　处：《化学通报》2023年第7期884-889,共6页Chemistry

基　　金：陕西省自然科学基础研究计划项目(2022JZ-54);陕西师范大学教学改革研究项目(22JG22,23JG33);陕西师范大学大学生创新创业训练项目(202210718003x,202310718131)资助。

摘　　要：为了获得滴定分析的终点误差随待测物浓度、反应平衡常数这两个因素变化的准确规律,推导了有别于林邦终点误差公式的终点误差计算式,根据该式可以判断每个因素对计算结果的影响,结合在配位滴定分析和酸碱滴定分析中的具体应用,结果发现,这两个因素大小的变化不一定会导致终点误差绝对值的单调变化。In order to acquire the accurate regulation as to how end-point error varying with two factors i.e.equilibrium constant of titration reaction and concentration of analyte,an other-than-Ringbom-formula end-point error formula is derived,where the effect of each factor on end-point error can be concluded.The applications of the new formula in both complexometric and acid-base titration demonstrate that the varying of either factor does not necessarily bring about monotonous varying of absolute value of the end-point error.

关 键 词：终点误差 反应平衡常数 浓度 配位滴定 酸碱滴定 

分 类 号：G642[文化科学—高等教育学] O655.2-4[文化科学—教育学]