应用离子选择性电极进行溶液热力学研究(Ⅺ)——RbCl在(H_2O-DMF)混合溶剂中溶剂化数的测定(298.15K～318.15K)

Using Ion selective Electrode to Study the Thermodynamics of Solution (Ⅺ) Determinations of Solvation Numbers of RbCl in (H 2O DMF)Mixed Solvents at 298.15K to 318.15K

应用Ｃｏｒｎｉｎｇ一价阳离子选择性电极和Ｏｒｉｏｎ固态氯离子选择性电极组成无液接可逆电池Ｃｌ－－ＩＳＥ／ＲｂＣｌ（ｍ），Ｈ２Ｏ（１－ｘ），ＤＭＦ（ｘ）／Ｍ＋－ＩＳＥ通过测定上述测量电池的标准电动势（Ｅｍ），根据溶液热力学原理，运用扩展的Ｄｅｂｙｅ－Ｈｕｃｋｅｌ公式，计算求得了ＲｂＣｌ由Ｈ２Ｏ至（Ｈ２Ｏ－ＤＭＦ）混合溶剂的标准迁移吉布斯自由能ΔＧｔ。运用Ｃｏｘ离子溶剂化配位模型，求得了ＲｂＣｌ在混合溶剂化数（ｎ＋＋ｎ－），并对ＲｂＣｌ溶剂化数的某些变化规律进行了初步的讨论。

The reversible cells without liquid junction consists of the corning monovalent cation selective electrode(M ISE)and choloride selectiv(Cl - ISE)electrode,namely. The standard electromotive forces ( E  m )of the measuring cells have been measured at four temperatures from 298.15K to 318.15K,and the standard Gibbs free energies of transfer(Δ G  t )of RbCl from H 2O to H 2O DMF mixed solvents and solvation numbers of RbCl in mixed sovents have been calculated.The behaviours of change of standard Gibbs free energies of transfer and solvation numbers of RbCl have been discussed on the basis of solvat ion theory of electrolyte solution.