当酸度计无斜率补偿 ,其仪器标度与 p H玻璃电极斜率不相等时 ,将产生测定误差 .出现了同一样品 ,不同实验组测定的结果不同 .根据电位法测定溶液 p H值原理 ,由电极电位和酸度计指示测定值 ,导出待测溶液实际 p H值准确计算式 ,消除了 S标度 ≠ S电极 时产生的测定误差 ,并用实验进行了验证和样品分析 . When the acidimeter without slope compensation, the instrument scale and p H glass electrode slope is not equal, will produce the measurement error. Appeared the same sample, the results of different experimental groups measured according to the potentiometry p H value of the principle of solution from The electrode potentials and the acidity meter indicate the measured value, and the accurate calculation formula of the actual p H value of the solution to be measured is deduced. The measurement error generated when the S scale is not equal to the S electrode is eliminated, and the experiment is used for verification and sample analysis.