Acta Phys. -Chim. Sin. ›› 1993, Vol. 9 ›› Issue (03): 366-373.doi: 10.3866/PKU.WHXB19930315

• ARTICLE • Previous Articles     Next Articles

Isopiestic Determination of the Osmotic and Activity Coefficients of Aqueous Mixtures of Li2SO4 and MgSO4

Zhang Zhong; Yao Yan; Song Peng-Sheng; Chen Jing-Qing   

  1. Institute of Salt Lakes, Academia Sinica, Xining 810008
  • Received:1991-10-11 Revised:1992-07-20 Published:1993-06-15
  • Contact: Yao Yan

Abstract: The osmotic coefficients of aqueous mixtures of Li_2SO_4 and MgSO_4 have been measured from 1.4 to 13.5 mol·(kg)~(-1) at 25 ℃ by using the isopiestic method. In the ranges of 0.2—8.7 and 0.6—12.7 mol·(kg)~(-1) the osmotic coefficients of Li_2SO_4 and MgSO_4 were also reported respectively. Ion interaction parameters of Pitzer model and Scatchard model have been calculated from these measurements. In comparison with Mckay-Perring method, the osmotic and activity coefficients for Li_2SO_4-MgSO_4 mixtures are fairly reliably represented by both Pitzer's equation and Scatchard's neutral electrolyte equation. The predicted solubilities for this system using Pitzer's approach show good agreement with experimental results.

Key words: Osmotic coefficient, Activity coefficient, Pitzer equation, Scatchard equation, Mckay-Perring method, Solubility