University Chemistry ›› 2018, Vol. 33 ›› Issue (3): 59-62.doi: 10.3866/PKU.DXHX201709038

• Chemistry Laboratory • Previous Articles     Next Articles

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
  • Supported by:


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


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