In:
Journal of Physical and Chemical Reference Data, AIP Publishing, Vol. 35, No. 1 ( 2006-03-01), p. 15-30
Abstract:
A semitheoretical approach for the ionization constant of water, KW, is used to fit the available experimental data over wide ranges of density and temperature. Statistical thermodynamics is employed to formulate a number of contributions to the standard state chemical potential of the ionic hydration process. A sorption model is developed for calculating the inner-shell term, which accounts for the ion–water interactions in the immediate ion vicinity. A new analytical expression is derived using the Bragg–Williams approximation that reproduces the dependence of a mean ion solvation number on the solvent chemical potential. The proposed model was found to be correct at the zero-density limit. The final formulation has a simple analytical form, includes seven adjustable parameters, and provides good fitting of the collected KW data, within experimental uncertainties, for a temperature range of 0–800 °C and densities of 0–1.2 g cm−3.
Type of Medium:
Online Resource
ISSN:
0047-2689
,
1529-7845
Language:
English
Publisher:
AIP Publishing
Publication Date:
2006
detail.hit.zdb_id:
2006308-8
SSG:
11
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