论文部分内容阅读
本文提出了一种强酸盐和标准碱两种溶液同时滴定的pH电位法,以简化金属离子—有机配体—强酸根离子体系的混配型配合物的研究方法。根据该实验方法,推导出在不生成酸式及多核配合物情况下混配型配合物稳定常数的计算公式。 研究了Cd(Ⅱ)—正己烷基亚氨二乙酸根离子(A)—氯离子(Cl)体系的配位平衡,在所研究范围内形成CdACl、CdACl_2,在25±0.1℃,μ=1.0的条件下,测得lgβ_(11)=7.60,lgβ_(12)=8.12。 讨论了两种溶液滴定法的优缺点及适用范围。该法具有快速、准确、仪器设备简单等特点。
In this paper, a pH titration method for simultaneous titration of strong acid salt and standard alkali solution was proposed to simplify the study of the mixed complex of metal ion - organic ligand - strong acid ion system. According to the experimental method, the formula for calculating the stability constant of mixed complex without the formation of acidic and polynuclear complexes is deduced. The coordination equilibrium of Cd (Ⅱ) -n-hexylidene diacetate (A) -chloride (Cl) system was studied. CdACl and CdACl_2 were formed in the studied range. At 25 ± 0.1 ℃ and μ = 1.0 Under the conditions, measured lgβ_ (11) = 7.60, lgβ_ (12) = 8.12. The advantages and disadvantages of the two titration methods and the applicable scope are discussed. The method is fast, accurate, simple equipment and other characteristics.