Acta Phys. -Chim. Sin. ›› 1991, Vol. 7 ›› Issue (06): 688-693.doi: 10.3866/PKU.WHXB19910610

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Activity Coefficients of o-, m-, p- Xylenes in Aqueous Salt Solutions(II)

Xie Wen-Hui; Wang Yu-Xing; Ji Hong-Wei   

  1. Department of Chemistry, Peking University, Beijing 100871
  • Received:1990-06-26 Revised:1991-04-20 Published:1991-12-15
  • Contact: Xie Wen-Hui

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Abstract: The activity coefficients and sahing-out constants of o-, m-, p-xylenes in six aqueous salt solutions at 25 ℃ are determined by spectrophotometric method. The salts used are Na_2SO_4, K_2SO_4, (NH_4)_2SO_4, MgSO_4 and MgCl_2. The relations logf-c_s are found to he all straight lines through the origin, in agreement with the Setschenow empirical formula. The order of salting-out ability is Na_2SO_4>K_2SO_4>(NH_4)_2SO_4>MgSO_4>MgCl_2
The experimental results of three xylenes are compared respectively with the calculated results of Debye-MacAulay and Conway-Desnoyers-Smith electrostatic theories, Masterton-Lee scaled particle theory and McDevit-Long internal pressure theory and internal pressure theory modified by Xie. The numerical calculation of the modified internal pressure theory agree with experimental data better.

Key words: Salt effect, Salting-out, Activity coefficient, Xylene