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关于氧化还原滴定终点误差公式近年来讨论较多。这些文献所提出的计算式,大多是将氧化还原滴定分为参加反应的两个电对都是对称性电对和有不对称电对参加反应等情况,加以分别讨论,计算公式的形式和推导过程都较为复杂,缺乏统一性。有的计算式以滴定剂O_T、被滴定剂R_x的克式量电位和终点电位E_(ep)表示;有的以终点电位E_(ep)和等当点电位E_(εq)之差△E表示。正如文献所指出的那样,终点误差固然和终点电位与等当点电位的差别有关,但更重要的是与氧化还原反应进行的完全程度有关,即与氧化还原反应的平衡常数有关。因此,终点误差公式应该同时反映这两个因素。
Redox titration endpoint error formula discussed in recent years more. Most of the equations proposed in these documents are divided into redox titration reaction is the symmetry of the two pairs of electricity and asymmetric electricity to participate in the reaction and so on, respectively, to discuss the form and deduction of the formula The process is more complex, the lack of unity. Some calculations with titrant O_T, titration potentials by the titrant R_x and the end potential E_ (ep) said; some of the end potential E_ (ep) and equivalent point potential E_ (εq) difference △ E . As the literature suggests, the end point error is certainly related to the difference between the end point potential and the equivalent point potential, but more importantly relates to the degree of completeness of the redox reaction, which is related to the equilibrium constant of the redox reaction. Therefore, the formula for the end point error should reflect both of these factors.