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The diffusivity of potassium chloride and sodium chloride in concentrated, saturated, and supersaturated aqueous solutions
Author(s) -
Chang Y. C.,
Myerson A. S.
Publication year - 1985
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690310603
Subject(s) - thermal diffusivity , supersaturation , chemistry , aqueous solution , potassium , mass diffusivity , sodium , saturation (graph theory) , thermodynamics , chloride , electrolyte , diffusion , analytical chemistry (journal) , inorganic chemistry , chromatography , organic chemistry , physics , mathematics , electrode , combinatorics
The diffusion coefficients of potassium chloride and sodium chloride were measured in concentrated, saturated, and supersaturated solutions at 25°C employing Gouy interferometry. The results indicate a maximum in the diffusivity vs. concentration curve near saturation followed by a rapid decline in diffusivity toward zero with increasing concentration in the supersaturated region. This behavior supports the idea that the diffusion coefficient approaches zero at the spinodal concentration. The data were successfully correlated by modifying an empirical activity coefficient equation (Robinson and Stokes, 1955) to account for molecular cluster effects and employing the calculated activity coefficients along with a predictive equation for diffusivity in electrolytes (Robinson and Stokes, 1955).