电导法测定弱电解质电离平衡常数实验的改进

Experimental Improvements on Determination of Dissociation Constant of Weak Electrolyte by Conductometry

电导法测定弱酸电离平衡常数实验是典型的物理化学实验,其中弱电解质经常选用弱酸,本实验选用新的一个一元弱酸-甲酸,在恒温条件下,分别测定甲酸和甲酸钠溶液的电导率的值,计算出甲酸的电离平衡常数,与文献报道结果相一致,研究出了一种新的对于广泛性的一元弱酸其电离平衡常数的测定方法,同时使学生能够从本实验的改进中,更加透彻地掌握电导率相关原理,并启发学生在设计实验时能开发新的实验设计思路和方法。

The conductivity method for measuring the weak acid ionization equilibrium constant is a typical Physical Chemistry experiment.Weak acids are often used for weak electrolytes.In this experiment,a new one-component weak acid-formic acid was used to measure the conductivity values of formic acid and sodium formate solution at constant temperature.The ionization equilibrium constant of formic acid was calculated,which was consistent with the results reported in the literature,and a new method for measuring the ionization equilibrium constant of a universal weak acid was developed.At the same time,students can learn more from the improvement of this experiment,master the principles related to conductivity,and inspire students to develop new ideas and methods for experiment design when designing experiments.