The salt diffusion of calcium chloride in its aqueous solutions has been the subject of experimental study of many workers in the past fifteen years. The results obtained by Harned and Levy indicate that the measured salt diffusion coefficients of calcium chloride are lower than the values computed from the Onsager-Fuoss theory in solutions of concentration between 0.001 and 0.005 formula weight per liter. The salt diffusion coefficients of calcium chloride in concentrated aqueous solutions have been determined by Hollingshead and Gordon and by Robinson and Chia by means of the diaphragm cell method, and independently by Stokes and co-workers and by Lyons and Riley by means of the optical method. Their results show that in calcium chloride solutions of concentration above 0.2 formular weight per liter the salt diffusion coefficient increases with increasing salt concentration up to about 2.2 formular weight per liter. This phenomenon has generally been attributed to the continual decrease of the activity coefficient of the salt along the diffusion path.
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Jui H. Wang (1953) studied this question.