混合酸、多元酸滴定的教学探讨  

Teaching Reflection on Titration of Mixed Acids and Titration of Polyacid

作　　者：陈冬年[1] CHEN Dong-Nian(Taizhou Institute of Science and Technology,Nanjing University of Science and Technology,Taizhou 225300,China)

机构地区：[1]南京理工大学泰州科技学院,江苏泰州225300

出　　处：《化学教育（中英文）》2022年第2期125-129,共5页Chinese Journal of Chemical Education

摘　　要：为解决混合酸(碱)、多元酸(碱)滴定教学中出现的问题,提出一些思路:(1)应在搞清滴定反应及其优先次序前提下,充分利用滴定曲线这一有力工具解决各种问题。(2)教学中,应遵循由易到难、步步深入的原则。在充分讲授单种一元酸滴定的基础上,可按强碱滴混合一元酸、强碱滴多元酸、强碱滴复杂混合酸的顺序安排教学内容。由于规律相似,所以在学生学完强碱滴定酸之后,只需对强酸滴定碱略作介绍即可。另外,提出一种无需复杂计算,仅利用单种一元酸(碱)滴定曲线拼合出复杂酸(碱)体系的近似滴定曲线的新方法,获得的曲线虽不十分精确,但足以给滴定分析可能性判断以及指示剂选择等问题提供有力的支持。In order to solve some puzzles in the teaching of titration of mixture of acids(bases)and polyacid(base),some ideas are put forward.(1)On the basis of understanding the titration reaction,we should make full use of the titration curve as a powerful tool to solve all kinds of problems.(2)In the process of teaching,we should follow the principle from the easier to the more advanced.On the basis of fully teaching the titration of single monoacid,the teaching contents can be arranged in the following order:titration of mixed monoacids with alkali,titration of polyacid with alkali,and titration of complex mixture of acids with alkali.Because the rules are similar,only a brief introduction of titration of base with strong acid is needed after the students have finished learning titration of acid with alkali.In addition,a new method for the obtaining titration curve of complex acids(bases)system by splicing single monoacid(base)titration curves without complex calculation is proposed.Although the obtained curve is not very accurate,it is sufficient to provide strong support for the possibility judgment of titration analysis and the selection of indicators.

关 键 词：混合酸的滴定 多元酸的滴定 滴定曲线 

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