强酸与多元酸混合物中各组分酸含量测定方法研究

Determination of Each Acid Content in Mixture of Strong and Polybasic Acids

各级离解常数均大于10^(-7),而且相邻两级的离解常数之比K_(a1)/K_(a2)只有几十倍的多元酸与强酸混合情况下,提出通过测量多元酸的半中和点,分别测定各组分酸含量的酸碱滴定法。

A convenient method for the determination of each acid content in mixture of strong acids and polybasic acids whose consecutive dissociation constants ratio of two neighboring levels. Ka1/Ka2, is noly several ten times was proposed, and the content calculation formula of strong acid, Ve2/VeT = V/VeT -1,was deduced theoretically under the condition that the half neutralization point of polybasic acids was first terminal point (or 1/3 neutralization point) whose pH was determined by using the polybasic acids containing sodium chloride as a standard solution.