两点电位滴定法测定乙醇/水混合溶剂中丙酸的电离常数  

Two-point Potentiometric Titration for Determining the Ionization Constant of Propionic Acid in EtOH/H_2O Mixed Solvent

作　　者：葛欣[1] 

机构地区：[1]沈阳医学院化学教研室,辽宁沈阳110031

出　　处：《当代化工》2001年第3期181-182,共2页Contemporary Chemical Industry

摘　　要：用两点电位滴定法测定了 (2 5± 0 .5 )℃时乙醇 /水体积分数比为 1 0 %、2 0 %、3 0 %、4 0%、和 5 0 %时丙酸的电离常数。该法测定步骤简单 ,结果准确可靠。在实验条件范围内 ,丙酸的pKa值随着乙醇量的增大而升高。The ionization constant of propionic acid was determined by two-point potentialtitration at (25±0.5)℃,and EtOH/H 2O at 10 %,20 %,30 %,40 % and 50 %. Compared with other methods, the operating is simple and accurate. With condition of experiment , The ionization constant of propionic acid increase as EtOHincrease.

关 键 词：两点电位滴定法 混合溶剂 丙酸 电离常数 乙醇/水 

分 类 号：O623.611[理学—有机化学]