半中和点法测定两种一元弱酸混合酸中各组分酸含量

Determination of Each Component Acid in Mixture of Two Different Weak Monoacids By Half Neutralization Point Method

本文根据两种一元弱酸混合物中测定各组分酸含量的标准曲线法,在理论上证明标准曲线的斜率(α_(A_2)-α_(A_1))值最大时,α_(A_2)=1-α_(A_1)=α_((HA)_1)并提出此时溶液pH值的测量方法,从而根据V_(e_2)/V_e^T=(V/V_e^T-1+α_(A_2))/(2α_(A_2)-1)公式,求出混合酸中各组分酸含量的方法,方法简单、可靠。

By the Standard curve method for the determination of the content of each component acid in mixture of two different weak monoacids, the formula αA2=1-αA1- =αHA1 was proved in theory when the slope of Standard curve (αAA2--αA1) is maximium, and the method for the determination of pH in the solution under such condition was proposed. Thus,the content of each component in mixture acids can easily calculate according to the formula