Paper Information

Journal:   IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION B- ENGINEERING   2003 , Volume 27 , Number B2; Page(s) 269 To 278.
 
Paper: 

CORRELATION OF THE MEAN IONIC ACTIVITY COEFFICIENTS IN 1:1 ELECTROLYTE SOLUTIONS USING THE GV-MSA MODEL

 
 
Author(s):  GHOTBI C., TAGHIKHANI VAHID*, AZIMI G.
 
* 
 
Abstract: 
The Ghotbi-Vera hard sphere equation of state as the reference system, coupled with the mean spherical approximation, (GV-MSA), has been used to accurately correlate the mean ionic activity coefficients of aqueous solutions of single 1:1 electrolytes. The new equation of state considers the ions to be hard spheres in Kelvin tetrakaidekahedron cells. The mean ionic activity coefficients of the electrolytes can be correlated with constant diameter of anions, equal to the crystallographic pauling diameter and with a concentration dependent relation for the cations. In comparison to their crystallographic pauling diameters, the new model for the mean ionic activity coefficient produces realistic hydrated diameters for cations. In addition, the like and unlike ionic pair correlation function (PCF) at contact value are positive at all rages of concentration. The results obtained from the rigorous GV-MSA are compared with those obtained with a simplified version of GV-MSA (SGV-MSA). The use of the simpler has small effect on the results and dramatically reduces the computation time. The results obtained from the new model are favorably comparable with those of the MSA perturbed with the BMCSL hard sphere equation of state and with those of pitzer"s model.
 
Keyword(s): ELECTROLYTE SOLUTIONS, HARD SPHERES, MEAN IONIC ACTIVITY COEFFICIENTS
 
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