两点电位滴定法测定醋酸电离常数及其热力学参数

Two-point Potentiometric Titration Was Used to Determined the Ionization Constant of Acetic Acid and the rmodynamic Parameter

用改进的两点电位滴定法测定醋酸在 1 5℃、2 5℃、3 5℃和 4 5℃条件下的电离常数 ,进而求出了醋酸根加质子反应的热力学参数△G、△H和△S .本方法与其它方法相比较 ,具有操作简单 ,结果准确等优点 .

The ionization constant of acetic aciol was determunecl by improved two-point potentimetric titration at 15,25,35 and 45℃, and the the rmodynamic parameter △G, △H and △S of acetic acid proton reaction was also calculated. Compared with other methods, the operating is simple and accurate.