大学化学 >> 2018, Vol. 33 >> Issue (3): 59-62.doi: 10.3866/PKU.DXHX201709038

化学实验 上一篇    下一篇

磺基水杨酸合铜配合物组成和稳定常数测定实验的改进

刘绍乾2,方正法1,杨章鸿1,董和大1,黄思1,*()   

  1. 1 湖南师范大学化学化工国家级实验教学示范中心, 长沙 410081
    2 中南大学化学化工学院, 长沙 410083
  • 收稿日期:2017-09-25 发布日期:2018-03-13
  • 通讯作者: 黄思 E-mail:1156827496@qq.com
  • 基金资助:
    湖南省教育厅项目(17C0947);2016中南大学本科教育教学改革研究项目(160010010)

Improvement of Stability Constant Determination of Sulfosalicylic Acid-Copper (Ⅱ) Complex

Shaoqian LIU2,Zhengfa FANG1,Zhanghong YANG1,Heda DONG1,Si HUANG1,*()   

  1. 1 National Demonstration Center for Experimental Chemistry and Chemical Engineering Education, Hunan Normal University, Changsha 410081, P. R. China
    2 College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
  • Received:2017-09-25 Published:2018-03-13
  • Contact: Si HUANG E-mail:1156827496@qq.com
  • Supported by:
    湖南省教育厅项目(17C0947);2016中南大学本科教育教学改革研究项目(160010010)

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摘要：

改进了教学实验中常用的磺基水杨酸铜配合物组成和稳定常数的测定方法，提出一种使用六亚甲基四胺-硝酸缓冲溶液控制体系pH的方法，预先配制磺基水杨酸的二钠盐溶液，省去强酸强碱反复调节溶液pH的过程，简化了实验操作。在pH 5.60时测得磺基水杨酸铜配合物的条件稳定常数为3.6×103，并推出其稳定常数为KCuL=3.6×109，与文献值KCuL=3.3×109基本一致。

关键词: 磺基水杨酸铜配合物, 缓冲溶液, 稳定常数

Abstract:

A method to improve the determination of composition and stability constant of sulfosalicylic acid-copper(Ⅱ) complex, a common experiment in university laboratory course, was proposed. In this study, a mixed solution of sulfosalicylic acid and sodium hydroxide was prepared in advance. The hexamethylene tetramine-nitric acid buffer solution was used to control the pH, which avoided repeatedly adjustment of the pH with a strong acid and a strong base and simplified the experiment process. At pH 5.60, the measured conditional stability constant was 3.6×103 and the deduced stability constant was 3.6×109, which was roughly consistent with the reported value (3.3×109).

Key words: Sulfosalicylic acid-copper(Ⅱ) complex, Buffer solution, Stability constant