EDTA标定实验中关键试剂“量”的探究  

Exploration of the Key Reagent“Quantity”in the EDTA Concentration Calibration Experiment

作　　者：魏巧华 孙瑞卿 许紫婷 WEI Qiao-Hua;SUN Rui-Qing;XU Zi-Ting(National Experimental Teaching Demonstration Center for Chemistry and Chemical Engineering,College of Chemistry,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福州大学化学学院化学化工国家级实验教学示范中心,福建福州350116

出　　处：《化学教育（中英文）》2022年第6期77-82,共6页Chinese Journal of Chemical Education

基　　金：2019年省级线下和社会实践一流本科课程;福州大学第10批高等教育教学改革工程项目(50010852);2019年福州大学一流本科教学改革建设项目(FDJG20190037)。

摘　　要：EDTA(乙二胺四乙酸二钠盐)浓度标定是大学化学中重要的基础实验。通过深化设计EDTA浓度标定实验方案,详细探究基准物质、氨水、NH_(3)-NH_(4)Cl缓冲液、Mg-EDTA(Mg-Y)及镁溶液、指示剂等关键试剂用量对标定过程和结果的影响,帮助学生加深对络合滴定的认识,掌握不同标定方法的适用条件,增强对实验试剂的作用和“量”的把握,提高分析和解决问题的能力。The calibration of EDTA concentration is an important basic experiment in university chemistry experiments.Through designing the experimental scheme of EDTA concentration calibration,this paper explores the influence of the dosage of the key reagent such as the primary standard,ammonia,NH_(3)-NH_(4)Cl buffer,Mg-EDTA(Mg-Y),magnesium solution and indicator on the calibration process and results.This study will not only help students to deepen their understanding of complexometric titration,master the applicable conditions of different calibration methods,and enhance their grasp of the function and“quantity”of experimental reagents,but also help to improve their ability of analyzing and solving problems.

关 键 词：EDTA标定 标定条件优化 关键试剂用量 

分 类 号：O655.2-4[理学—分析化学] G642.423[理学—化学]