大学化学 >> 2016, Vol. 31 >> Issue (6): 58-61.doi: 10.3866/PKU.DXHX201506014

化学实验 上一篇    下一篇

电导法测定醋酸的电离平衡常数实验的改进

陈玉焕*(),张姝明,王桂香,张颖   

  • 发布日期:2016-06-29
  • 通讯作者: 陈玉焕 E-mail:yhchen@hebut.edu.cn
  • 基金资助:
    河北工业大学2015年教育教学改革研究项目(201501003);河北省高等教育学会"十二五"规划2015年度课题(GJXH2015-274)

Experimental Improvements on Determination of Dissociation Constant of Acetic Acid by Conductometry

Yu-Huan CHEN*(),Shu-Ming ZHANG,Gui-Xiang WANG,Ying ZHANG   

  • Published:2016-06-29
  • Contact: Yu-Huan CHEN E-mail:yhchen@hebut.edu.cn
  • Supported by:
    河北工业大学2015年教育教学改革研究项目(201501003);河北省高等教育学会"十二五"规划2015年度课题(GJXH2015-274)

摘要:

对电导法测定醋酸电离平衡常数实验做出以下改进:使用恒温水浴、改变溶液配制方法和电极使用方法。以上改进使实验结果更加准确、可靠;避免了实验中大量容量瓶的使用、清洗及润洗过程,使实验操作更加简单快捷;减少了醋酸的用量,降低实验成本;延长了电极的使用寿命;同时加深了学生对该实验原理和方法的理解。

关键词: 醋酸, 电离平衡常数, 电导率, 实验改进

Abstract:

Experimental improvements on determination of dissociation constant of acetic acid have been made by using thermostat, improving solution preparation, and changing the way of using electrode. These improvements greatly expand the lifetime of electrodes and reduce the amount of reagents, reducing the experimental cost. The experimental procedure is much simpler and results are more accurate. These improvements enhance the students' understanding about the principle and the method.

Key words: Acetic acid, Dissociation constant, Conductivity, Experimental improvement

MSC2000: 

  • O646.1