Acta Phys. -Chim. Sin. ›› 1998, Vol. 14 ›› Issue (08): 691-697.doi: 10.3866/PKU.WHXB19980805

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Determination of Activity Coefficients of RbCl in (H2O-DMF) Mixed Solvents at 283.15 to 318.15K

Li Lin-Wei, Chu De-Ying, Liu Rui-Lin   

  1. College of Chemistry and Molecular Engineering,Peking University,Beijing 100871|Department of Chemistry,Liaocheng Teacher's College,Liaocheng 252059
  • Received:1997-10-13 Revised:1997-12-24 Published:1998-08-15
  • Contact: Chu De-Ying

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Abstract:

 The reversible cell used in this work consists of the monovalent cation selective electrode and chloride selective electrode, namely
Cl--ISE|RbCl(m), H_2O(1- x)- DMF(x)| M+ - ISE
The standard electromotive forces of the above cells have been measured at seven temperatures ranging from 283.15 to 318.15 K, and standard free energies of transfer Gt of RbCl from H2O to H2O-DMF mixed solvents, mean ionic activity coefficients of RbCl in mixed solvents and its medium effects have been calculatcd. The behavior of Δ?Gt and of RbCl with mole fractions x of DMF in the mixed solvents have been discussed.

Key words: RbCl, H2O-DMF, Standard free energy of transfer, Activity coefficients, Medium effect