Activity coefficients and thermodynamic parameters for RbCl/CsCl plus amide (acetamide, propanamide, and n-butanamide) plus water system at 298.15 K

作者：Jiang YC^*; Hu MC; Fan P; Wang JJ; Zhuo KL

来源：Biophysical Chemistry, 2005, 118(1): 25-30.

DOI：10.1016/j.bpc.2005.06.010

• RbCl/CsCl
• amide
• activity coefficients
• thermodynamic parameters

Electromotive force (emf) of the chemical cell without liquid-junctionK-ISE vertical bar RbCl/CsCl (m(E)) vertical bar ISE-Cl and K-ISE vertical bar RbCl/CsCl (m(E)), amide (m(N)) vertical bar ISE-Cl, have been measured at 298.15 K, where m(E)=(0.005 to 0.5)mol kg(-1) land m(N)=(0.05 to 3.0)mol kg(-1). The activity coefficients of RbCl/CsCl in amide (acetamide, propanamide, and n-butanamide) + water mixture can be obtained from these electromotive force data and in the mean time the Gibbs free energy interaction parameters of RbCl/CsCl + amide pair in water, g(EN), as well as the salt constant, k(S), can be evaluated. The results show that both g(E)> 0, k(S)> 0 at 298.15 K, and all the activity coefficients of electrolyte in amide + water mixture increase with increasing the m(N), but it is a little complicated for the dependence of activity coefficients on m(E). These thermodynamic parameters were discussed in terms of a model of the structural interaction and electrostatic interaction and the dependence of them on the number of carbon atoms in amide as well as the radius of metal ions were interpreted by the group additivity principle.

• 出版日期2005-10-22
• 单位河南师范大学; 陕西师范大学