论文部分内容阅读
提出了一种间接的但十分简单的方法测定Ba~(2+)与13-冠-6的络合平衡常数。在不同浓度的18-冠-6水溶液中,分别加入难溶盐BaF_2。使其饱和,然后对各溶液进行~(19)F NMR定量测定。根据络合平衡和难溶盐的溶解平衡,确定了Ba~(2+)与18-冠-6的络合平衡常数。
An indirect but very simple method was proposed to determine the complex equilibrium constants of Ba 2+ and 13-crown-6. In different concentrations of 18-crown-6 aqueous solution, were added into the insoluble salt BaF_2. The solution was then subjected to ~ (19) F NMR quantitative determination. According to the equilibrium of complexation and the solubility of insoluble salts, the complex equilibrium constants of Ba ~ (2+) and 18-crown-6 were determined.