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以HCl溶液直接滴定极弱碱NaAc为例，推导出恒pH滴定法的理论误差计算式，为恒pH滴定法固定pH值的正确选择提供了理论根据。并在此基础上提出了固定△pH值测定法以及该法的主要特点。
The direct calculation of the theoretical error of constant pH titration with HCl solution as an example is the direct titration of very weak base NaAc, which provides a theoretical basis for the correct selection of constant pH titration with constant pH titration. And on this basis, a fixed △ pH determination method as well as the main features of the law.