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Citation: Xie Wen-Hui, Wang Yu-Xing, Ji Hong-Wei. Activity Coefficients of o-, m-, p- Xylenes in Aqueous Salt Solutions(II)[J]. Acta Physico-Chimica Sinica, ;1991, 7(06): 688-693. doi: 10.3866/PKU.WHXB19910610 shu

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

1.
Department of Chemistry, Peking University, Beijing 100871

Received Date: 26 June 1990
Available Online: 15 December 1991

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.
- Salt effect; Salting-out; Activity coefficient; Xylene
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