在强酸与一元弱酸混合酸中影响各组分酸含量测定的因素及条件

Factors and conditions of determining each acid content in a mixture of strong and weak monoacid

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。

Abstract The method of determining the content of each acid from a mixture of strong and weak monoacids was previously reported when the pH was over 3.7 at the first terminal point.The factors of affecting each acid content were confirmed by deducing the relation of error value △Ve2/VeT and pH, and the permited maxium of α that could make exact titration at different pH value of the first terminal point was calculated. The results showed that the satisfactory results of determining the content of each acid could be got when the pH was over 2.6 at the first terminal point.