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Mutual Diffusion Coefficients of ZnCl2-H2O at 298.15 K by Rayleigh Interferometry

• dm"3 that may be due to selfcomplexing. Other workers have reported related anomalies in tracer diffusion coefficients of the H20, in viscosities, and in activity coefficient derivatives of ZnCl2 solutions. These anomalies appear to be characteristic of and limited to zinc halide solutions. Two commercial sources of ZnCl2 were found to contain large amounts of alkali metal and alkaline earth metal impurities; these impurities raise the diffusion coefficients but have little effect on the anomaly. Thermodynamic diffusion coefficients were calculated for ZnCl2 solutions and compared to similar data for other 2-1 chlorides; of the salts studied