连续滴加法快速测定混合溶剂中电解质的活度系数  

A SHORT-CUT DETERMINATION OF ACTIVITY COEFFICIENTS FOR ELECTROLYTE IN MIXED SOLVENT BY ADDING CONTINUOUSLY A CONCENTRATED ELECTROLYTE SOLUTION

作　　者：张吕正[1] 陆小华[1] 王延儒[1] 时钧[1] 

机构地区：[1]南京化工学院化学工程系

出　　处：《南京化工学院学报》1992年第1期22-29,共8页

基　　金：国家自然科学青年基金

摘　　要：改变通常的逐点称重配制溶液方法,用连续滴加的方法借助离子选择电极建立了混合溶剂中电解质较高浓度下活度系数的快速测定方法和装置。用以下电池: H^+玻璃电极|HCl(m),H_2O(1-x),MeOH(x)|AgCl-Ag电极测定了298.15K、溶剂比x=0,10,20,30,50,70,90％MeOH(wt)时的电动势,并用Pitzer方程关联出HCl的活度系数,同298.15K下的活度系数不同来源的文献值比较,表明本文测定方法和装置是可靠的,都能得到与之相一致的结果。A short-cut method and the experimental apparatus used to determine activity coefficients for electrolyte in mixed solvent have been established with the help of ion-selective electrodes by adding concentrated electrolyte solution continuously rather than by weighting samples one by one.Activity coefficient values for HCI in methanol-water mixtures containing X=0, 10, 20, 30, 50, 70, 90 weight precent of methanol at 298. 15 K are calculated from the electromotive force (emf) with Pitzer equation for the following cell:pH-glass electrode |HCl(m), H_2O(1-X), MeOH (X)|AgCl—AgThe experimental results agree well with those available in literature.

关 键 词：活度系数 电解质 离子选择电极 

分 类 号：O645.17[理学—物理化学]