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Biophysical Journal 8: 1426-1433 (1968)
© 1968 the Biophysical Society

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The Thermodynamic Activity of Calcium Ion in Sodium Chloride-Calcium Chloride Electrolytes

James N. Butler

ABSTRACT

Experimental data on the mean activity coefficient of CaCl2 in NaCl-CaCl2 mixtures at ionic strengths below 1 m have been used to prepare a table of activity coefficients for Ca++ in solutions of physiological interest. The establishment of an empirical calcium ion activity scale is discussed, and a number of possible assumptions are examined. The assumption {gamma}++ = ({gamma}±)2 is suggested as being the simplest with a theoretical basis.




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Copyright © 1968 by the Biophysical Society.