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Fe(Phen)_3~(2+)是一种配位数较高、形成常数较大的配合物(logK_形=21.3).由于它的离解度很小,在教学实验的条件下,用摩尔比法和平衡移动法测定形成常数已很困难.笔者利用稀释显色溶液对朗伯-比耳定律产生的偏离进行测定,取得较为满意的结果.稀释法是??首先提出的.国内对此法介绍较少,认为它适用于离解度较大的配合物的测定.但对离解度虽很小,而配位数较高的配合物,它仍是一种可能的测定方法.本文就稀释法测定Fe
Fe (Phen) _3 ~ (2+) is a complex with a high coordination number and a large constant formation (log K_form = 21.3). Due to its small dissociation degree, Fe It has been very difficult to determine the formation constants by the molar ratio method and the equilibrium shift method. The author uses the diluted chromogenic solution to determine the deviation of the Lambert-Beer’s law and obtains more satisfactory results. The dilution method is first proposed This method is less introduced, and it is considered to be suitable for the determination of complex compounds with a high degree of dissociation, but it is still a possible method for the determination of a complex with a small degree of dissociation and a high coordination number. Dilution method for the determination of Fe