化学
卤化物
电位滴定法
离子强度
无机化学
水溶液
离子键合
离子液体
分析化学(期刊)
离子
电离
钾
接受者
物理化学
电极
催化作用
色谱法
有机化学
物理
凝聚态物理
作者
Faradj K. Samani,Stephen G. Capewell,Pál Sipos,Peter M. May,Glenn Hefter
摘要
The ionic product of water, pKw = –log[H+][OH–], has been determined as a function of ionic strength (I ) in concentrated aqueous solutions of KCl, KBr and KI at 25˚C by high-precision glass electrode potentiometric titrations. The pKw values obtained are in excellent agreement with, but generally more precise than, literature data. At I > 1 M the pKw values increase smoothly and show systematic differences in the order KCl < KBr < KI, consistent with the decreasing H+-acceptor ability of the medium anions. Analogous behaviour is observed in MCl solutions, with pKw values varying in the order NaCl < KCl < CsCl. Formation constants of MOH0 ion pairs derived from these data are consistent with literature values.
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