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终点误差是高等分析化学课程的重要内容。当前分析化学教材多采用浓度定义式,并在此基础上推导出各种计算式。这种“公式化”的策略简单方便,但是没有实现统一计算,记忆负担重,而且难以解决复杂问题。本文从理论上证明了体积定义式完全等价于浓度定义式,从而为通过体积定义式统一计算终点误差提供支持,同时消除对体积定义式的误解。结果表明,体积定义式具有适用范围广、记忆负担轻、以及运算强度低的优点,能够统一四大滴定的终点误差计算。此外,对现行教材中的终点误差计算策略进行了梳理和归纳,剖析了现状,讨论了林邦公式在终点误差统一计算方面的缺陷,为相关研究提供参考。
End point error is an important part of advanced analytical chemistry courses. The current analytical chemistry textbooks mostly use the definition of concentration, and on this basis derived a variety of formulas. This strategy of “formulating” is simple and convenient, but without unified calculation, heavy memory and difficult to solve complex problems. This paper theoretically proves that the volume definition is completely equivalent to the concentration definition and thus provides support for the uniform calculation of the end point error by means of the volume definition and eliminates the misunderstanding of the volume definition. The results show that the volume definition has the advantages of wide range of application, light memory burden and low computational intensity, and can unify the calculation of the end point error of the four titration. In addition, the calculation method of end point error in current textbooks is summarized and summarized. The status quo is analyzed, and the deficiencies of the Lyapun formula in the unified calculation of end point error are discussed, which can provide references for related research.