By 
This work presents a model for thermodynamic properties of the uni-univalent electrolytic solutions
based on a linear relation between a dimensionless-thermodynamic potential constructed for solvent
and a newly defined probability-distribution function of water molecules around the hydrated central
ion. The model allows quantitative reproduction of the osmotic coefficients for the uni-univalent
electrolytic solutions, especially some hydroxides of alkali metals and monoacids such as NaOH,
KOH, LiOH, HF, HCl, HBr, HI, HNO3 and H(HSO4), within experimental accuracy. A comparison is
made of the results of the presented model with the Pitzer’s equation. This paper also introduces an
alternative approach for the probability-distribution function, which makes the model be able to extend
to the single electrolyte solutions with various valent types.
Author(s) Details
Zheng Fang
Chemistry and Chemical Engineering College, Central South University, Changsha 410083, P.R. China
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