Acta Phys. -Chim. Sin. ›› 1993, Vol. 9 ›› Issue (03): 392-397.doi: 10.3866/PKU.WHXB19930319

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Studies on Activity Coeficients of Chlorobenzene System in Aqueous salt Solutions

Xie Wen-Hui; Zheng Zi-Qin; Tang Ming; Li Dong   

  1. Department of Chemistry, Peking University, Beijing 100871
  • Received:1991-12-29 Revised:1992-11-25 Published:1993-06-15
  • Contact: Xie Wen-Hui

Abstract: The activity coefficients of chlorobenzene, m-,p-dichlorobenzene and 1,2,4-tri-chlorobenzene in NaCl, KCl, Na_2CO_3, K_2SO_4 and CaCl_2 aqueous salt solutions, and chlorobenzcne in Et_4NBr have been determined at 298.15 K by spectrophotometry.
The chlorobenzene in Et_4NBr aqueous salt solution is salting-in, while others are salting-out. The experimentsl salting-out orders are as follows: K_2SO_4>Na_2Co_3>CaCl_2>NaCl>KCl. These results are compared with the calculated results of Debye-McAulay and Conway-Desnoyers-Smith electrostatic theories; Masterton-Lee scaled particle theory. McDevit-Long internal pressure theory and modified internal pressure theory. It is verified that the modified internal pressure theory coincides with the experimental value better.

Key words: Activity coefficient, Salt effect, Chlorobenzene system