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This paper deals with the determination of tracer diffusion coefficients of Cr 3+ ions in agar gel media containing MnSO 4 , CuSO 4 , CoSO 4 , NiSO 4 , and ZnSO 4 . The diffusion coefficients in various electrolytes were measured over the electrolyte concentration range (5 · 10 -7 to 10 -2 ) M using the zone diffusion technique at 25°C. The resulting values are compared with theoretical values obtained using Onsager's theory, and the observed deviations are explained qualitatively on the basis of various interactions occurring in the ion-gel-water system.