HCl-NaCl-C_3H_8O_3-H_2O体系溶液热力学性质  

Thermodynamic Properties of the System of HCl-NaCl-C_3H_8O_3-H_2O

作　　者：吕殿祯[1] 杨家振[1] 王琴萍[1] 邓敏[1] 段继芳 陈峥 

机构地区：[1]辽宁大学化学科学与工程学院,沈阳110036

出　　处：《物理化学学报》1998年第2期121-126,共6页Acta Physico-Chimica Sinica

摘　　要：在恒定丙三醇质量分数x=0．1的条件下，测定了无液接电池（A）和电池（B）的电动势根据电池（A）电动势确定了丙三醇和水混合溶剂中的Ag－AgCl电极的标准电极电势，讨论了HCl的迁移性质；由电池（B）测得的电动势计算了HCl在该体系中的活度系数γA，计算的结果表明，对于所讨论的体系，在溶液中总离子强度保持恒定，HCl的活度系数服从Harned规则．在溶液组成恒定时，IgγA是温度倒数1／T的线性函数，讨论了混合物中HCl的相对偏摩尔焓及介质效应．The thermodynamic properties of the system HCl-NaCl-C3H8O3-H2O was studied bymeans of emf measurement in the following cells without liquid junctions:at constant total ionic strength I=0.5, 1.0. 1.5 and 2.0mol.kg-1 , from 5 to 45 ℃, where mA andmB are the molalities of HCl and NaCl. respectively, x is the weight fraction of glycerol in themixed solvent, which was 0.1 during all measurements.The standard electrode Potential of Ag-AgCl in the mixed solvent have been determined fromcell (A). The activity coefficients of HCl, γA in the mixed solvent system have been determinedfrom cell (B). The results show that the activity coefficients of HCl in HCl-NaCl solution still obeysHamed rule, and igγA is a linear function of the reciprocal of the absolute temperature at constantcomposition of the mixture. Relative molar enthalpies of HCl LA arc linear function of the ionicstrength fraction of NaCl at constant total ionic strength temperature. The standard Gibbsfree energies of transfer of HCl have been calculated. The primary secondary and total mediumeffect of HCl have been calculated and discussed.

关 键 词：标准电极电势 偏摩尔焓 甘油 水 盐酸 混和溶剂 

分 类 号：O645.164[理学—物理化学]