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一元弱酸的ＣａＫａ小于１０（－８）的情况下，通过推导滴定所消耗的碱标准溶液摩尔数和极弱一元酸摩尔数之间的线性关系并分析结果误差△Ｖｅ／Ｖｅ的计算式，提出了极弱一元酸标准溶液和样品溶液对照法测量极弱一元酸含量的方法。实验结果表明，ＣａＫａ大于３．４×１０（－１２）的条件下，分析结果的误差△Ｖｅ／Ｖｅ均小于１．０％。
When the CaKa of a weak weak acid is less than 10 (-8), a linear relationship between the number of moles of alkali standard solution consumed and the number of moles of very weak monocarboxylic acid consumed by titration is derived and the calculation formula of the result error? Ve / Ve is proposed A very weak monobasic acid standard solution and sample solution control method for measuring very weak monobasic acid. The experimental results show that the error △ Ve / Ve of the analytical results is less than 1.0% when the CaKa is greater than 3.4 × 10 (-12).