RbCl在H_2O-DMF混合溶剂中活度系数的测定  

Determination of Activity Coefficients of RbCl in (H_2O-DMF) Mixed Solvents at 283.15 to 318.15K

作　　者：李林尉[1] 褚德萤[2] 刘瑞麟[2] 

机构地区：[1]聊城师范学院化学系,聊城252059 [2]北京大学化学与分子工程学院,北京100871

出　　处：《物理化学学报》1998年第8期691-697,共7页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金

摘　　要：应用Corning-价阳离子选择电极（M~＋－ISE）和Orion氯离子选择电极组成可逆电池，CI~－－ISE|RbCl（m），H2O（1－x），DMF（x）M^+－ISE．测量该电池标准电动势E_m，运用扩展的Debye－Hckel公式，计算RbCl在283．15至318．15K七个温度下由H2O至H2O－DMF混和溶剂的标准迁移自由能ΔG和在不同组成（H2O－DMF）混合溶剂中平均离子活度系数γ±，并对迁移自由能及活度系数随混合溶剂有机物组份的摩尔分数的变化进行了讨论。The reversible cell used in this work consists of the monovalent cation selective electrodeand chloride selective electrode, namelyCl^--ISE|RbCl(m), H_2O(1- x)- DMF(x)| M+ - ISEThe standard electromotive forces of the above cells have been measnred at seven temperaturesranging from 283.15 to 318.15 K, and standard free energies of transfer Gt of RbCl fromH2O to H2O-DMF mixed solvents, mean ionic activity coefficients of RbCl in mxed solventsand its medium effects have been calculatcd.The behavior of Gt and of RbCl with mole fractions x of DMF in the mixed solventshave been discussed.

关 键 词：DMF 活度系数 标准迁移自由能 氯化铷 水 测定 

分 类 号：O614.114[理学—无机化学] O645.17[理学—化学]