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  • 1 University of Poona Department of Chemistry 411 007 Pune India
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The obstruction effect and activation enerqy for the self-diffusion of Co2+ ions in CoSO4 have been computed using the zone-diffusion technique in agar gel medium at five different concentrations of the electrolyte. Both parameters are found to decrease with an increase in electrolyte concentration. The decrease in obstruction effect expressed in terms of is attributed to the competitive hydration between ions and agar molecules in a diffusion system while the decrease in activation energy is explained by considering the changes in the physical properties of the solution with concentration at microscopic level.