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在前文中曾提出，第一终点ｐＨ大于３．７的情况下，以αＡ－等于０．１０７１时的ｐＨ值为第一终点测定各组分酸含量的方法．当第一终点ｐＨ小于３．７时，在理论上通过推导分析结果的误差△Ｖｅ２／Ｖ与△ｐＨ之间的关系式，明确了影响各组分酸含量测定的因素，并推算出不同的第一终点ｐＨ时可以准确滴定的αＡ－的最大值．实验结果表明，第一终点ｐＨ大于２．６的情况下，可以得到满意的结果。
In the foregoing it has been proposed that the first end point pH is greater than 3.7 and the acid content of each component is determined as the first end point with a pH value at alphaA- equal to 0.1071. When the first endpoint pH is less than 3.7, in theory by deriving the relationship between the error △ Ve2 / V and △ pH, the factors that affect the determination of the acid content of each component is clear and different The first end point of the pH can be accurately titrated when the maximum αA-. The experimental results show that the first endpoint pH greater than 2.6, the results can be satisfactory.