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本文采用pH玻璃电极测试15℃、20℃、25℃、30℃、35℃时与丙酸在10、20、30、40、50、60vol1％甲醇-水介质中的pKa及离解过程的标准等压热容Cp~e、标准熵变△S~e、标准焓变△H°和标准吉布斯自由能改变△G~e。用PH玻璃电极测试的方法较标准氢电极方法仪器设备简单,操作方便,测得的pKa的准确程度也较高,开拓了PH玻璃电极的应用领域。
In this paper, pKa and the dissociation process of propionic acid in 10, 20, 30, 40, 50, 60vol1% methanol-water media at 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃ Pressurization volume Cp ~ e, standard entropy change △ S ~ e, standard enthalpy change △ H ° and standard Gibbs free energy change △ G ~ e. PH glass electrode test method than the standard hydrogen electrode method equipment is simple, easy to operate, the measured pKa higher accuracy, opening up the application of PH glass electrode.