在强酸与多元酸混合酸中影响各组分酸含量测定的因素及条件

The Factors and Condition in Determination of Each Acid Content From Mixture of Strong and Polybasic Acids

在前文中曾提出，第一终点ＰＨ＞３．７的情况下，以多元酸标准溶液的半中和点为第一点，测定各组分酸含量的方法。在此基础上，本文在理论上明确了影响各组分酸含量测定的因素，从而提出第一终点ＰＨ不同的情况下，Ｋａ１／Ｋａ２倍数不同时可准确滴定的Ｖｅ２／Ｖ＾Ｔｅ值的计算方法。实验结果表明，在此条件下结果是可靠的。

In the previous paper, we proposed a method for determining each acid content byhalf neutralization point(or 1/3 neutralization point) of standard solvent of polybasic acids as the first terminal point, when the pH value of first terminal point is over 3. 7. On the basis of this, we defined the factors which affect the determination of each acid content theoretically and then proposed the calculating method for determining the value of Ve2/VeT accurately when the value of Ka1/Ka2 is different. the test showed that result is reliable in this condition.