手持技术探究酸碱滴定过程中缓冲容量的变化  

Exploring the changes of buffering capacity during acid-base titration by using handheld technique

作　　者：郑海鹏 钟鸣 陈鲜丽[1] 郑兰 ZHENG Haipeng;ZHONG Ming;CHEN Xianli;ZHENG Lan(School of Chemistry and Civil Engineering,Shaoguan University,Shaoguan 512005,China;Medical College,Shaoguan University,Shaoguan 512005,China)

机构地区：[1]韶关学院化学与土木工程学院,广东韶关512005 [2]韶关学院医学院,广东韶关512005

出　　处：《高师理科学刊》2024年第1期97-104,共8页Journal of Science of Teachers＇College and University

基　　金：韶关学院第二十四批(2023年度)校级教育教学改革研究项目(SYJY20231030)。

摘　　要：针对韶关学院基础化学课程中酸碱滴定的学习内容,以酸碱滴定为基础,绘制滴定过程中溶液缓冲容量的变化图,并结合型体分布分数的知识联合讨论酸碱滴定过程中溶液缓冲容量变化,扩充了酸碱滴定和缓冲容量的知识,可以加深临床医学本科专业学生对酸碱滴定的理解.使用手持技术实验设备中的pH传感器和滴数传感器设计了酸碱滴定实验,使用NaOH溶液分别滴定HAc,H_(2)C_(2)O_(4),H_(3)PO_(4)溶液,绘制相应的pH-V曲线和β-pH曲线,基础借助δ-pH曲线解释缓冲容量变化,并联合分析其滴定过程中缓冲容量的变化,有利于加深学生对酸碱滴定和缓冲溶液的理解.Aiming at the learning content of acid-base titration in the basic chemistry course of Shaoguan University,based on the acid-base titration,the change diagram of the buffer capacity of the solution during the titration process was drawn,and the change of the buffer capacity of the solution during the acid-base titration process was discussed in combination with the knowledge of the distribution fraction.The knowledge of acid-base titration and buffer capacity can deepen the understanding of acid-base titration by undergraduates majoring in clinical medicine.The acid-base titration experiment was designed by using the pH sensor and the drop sensor in the handheld technology experimental equipment.The HAc,H_(2)C_(2)O_(4) and H_(3)PO_(4) solutions were titrated by NaOH solution,and the corresponding pH-V curve andβ-pH curve were drawn.Theδ-pH curve was used to explain the change of buffer capacity,and the change of buffer capacity in the titration process was analyzed,which was helpful to deepen the students′understanding of acid-base titration and buffer solution.

关 键 词：手持技术 PH传感器 滴数传感器 滴定曲线 分布型体 缓冲容量 

分 类 号：O65[理学—分析化学] G642.0[理学—化学]