【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K_CuL=3.6×10⁹,与文献值K_CuL=3.3×10⁹基本一致。更多还原

【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 × 10~3 and the deduced stability constant was 3.6 × 10~9, which was roughly consistent with the reported value(3.3 × 10~9).更多还原