摘要
采用电位滴定法 ,在乙醇 /水混合溶剂体系中 (I=0 10mol/L ,KCl) ,测定了苯酚、α 萘酚与 β 萘酚在不同乙醇含量(V/V总)时的离解常数 .结果表明 :在实验范围内 ,pKa 同乙醇含量的体积分数存在良好线性关系 .通过外推 ,求得在实验条件下 ,水溶液中苯酚、α 萘酚与 β 萘酚的离解常数pKa 分别为 9 80、9 40和 9 76.
The dissociation constants of phenol, α naphthol and β naphthol in water ethanol mixed solvent ( I =0 10?mol/L,KCl) were determinded by potentiometric titration. The results showed that the p K a was a good linear function of the volume fraction of ethanol in the concentration range studied. The dissociation constants of phenol, α naphthol and β naphthol in water were determinded by extrapolation to be 9 80,9 40 and 9 67 under the conditions of this experiment.
出处
《南京师范大学学报（工程技术版）》
CAS
2003年第4期18-20,58,共4页
Journal of Nanjing Normal University(Engineering and Technology Edition)
关键词
苯酚
Α-萘酚
Β-萘酚
混合溶剂
离解常数
电位滴定法
phenol, α naphthol, βnaphthol, mixed solvent,dissociation constants, potentiometric titration
