化学
对苯二酚
结合
弱碱
离解常数
酸离解常数
共轭酸
溶剂
酸碱反应
离解(化学)
无机化学
布朗斯特德-洛瑞酸碱理论
基础(拓扑)
水溶液
有机化学
催化作用
离子
数学分析
生物化学
受体
数学
作者
Jiaojuan Teng,Junjie Pang,Yonghong Sun,Jianguo Wang
标识
DOI:10.1016/j.jelechem.2022.116172
摘要
The pKa and pKb of Bronsted–Lowry weak acids and weak bases in aprotic solvents are difficult to accurately determine. Herein, we found that in an aprotic solvent, the conjugate base of weak acid can produce a new, unambiguous anodic peak of hydroquinone, and the conjugate acid of weak base can produce a new cathodic peak of p-benzoquinone. These new peaks were due to the drastic change in pH near the electrode surface, and their potentials depended on the strength of conjugate acids and bases but not on the concentration of hydroquinone and quinone. Therefore, the conjugate acid–base dissociation constant can be measured by the new peak potential. Then, the weak acid–base dissociation constant can be obtained by the difference between the autoprotolysis constant of the aprotic solvent and the conjugate acid–base dissociation constant. The experimental results were consistent with those in literature.
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