ELECTROLYTE DIFFUSION OF COBALT AND MANGANESE SALTS IN WATER

Electrolyte diffusion coefficients of CoCl2, Co(NO3)(2), MnCl2 and MnS O4 in water have been measured using Co-60(2+) and Mn-54(2+) as tracer s with an open-ended, rapid improved capillary technique without stirr ing. Nanis analytical solution for non-stirring mode is used for compu tation of these electrolytes over a concentration range of 10(-5)-0.25 M at 25 +/- 0.1 degrees C. The measured diffusion coefficient values are compared with the theoretical values estimated on the basis of Ons ager-Fuoss theory. The experimental diffusion coefficients agree reaso nably well at low concentrations. The observed deviations between theo retical and experimental diffusion coefficients at high concentrations are attributed to the occurrence of ion-ion interactions which are no t considered while formulating the Onsager-Fuoss theory.