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物理化学实验测定二级反应的速率常数,通常选用乙酸乙酯皂化反应这个经典实验。对实验数据处理,一般是将动力学方程的积分式整理成线性形式,然后按实验数据作图或作回归计算而求速率常数。方程的线性形式可有多种表示法,但无论何种形式,测定起始时的电导率L_0或反应终了时的电导率L_∞(电导法)都是少不了的。本文介绍一种所谓“倍时数据对”方法,则不必测定L_0、L_∞,从而可使实验简化,节约时间和试剂。
Physical and chemical experiments to determine the rate of the second-order reaction rate, usually selected ethyl acetate saponification reaction of this classic experiment. For experimental data processing, the integral of kinetic equation is usually sorted into a linear form, and then the rate constant is calculated by plotting the experimental data or making regression calculation. The linear form of the equation can have a variety of representations, but no matter what the form, the initial conductivity L_0 or the conductivity at the end of the reaction L_∞ (conductivity method) are indispensable. This article describes a so-called “time-doubled data pair” approach that eliminates the need to measure L_0, L_∞, which simplifies the experiment and saves time and reagents.