Self-diffusion of Co2+ ions in CoBr2, CoI2 and electrolyte-diffusion of ZnSO4 in agar gel medium

Self-diffusion of Co2+ ions in CoBr2 and CoI2 is reported in the concentrat ion range of 10(-5) to 0.25M in 1% agar gel at 25 degrees C. The deviations observed between the experimental and theoretical values of diffusion coef ficients are explained by considering different types of interactions occur ring in the ion-gel water system. The applicability of the transition state theory to the diffusion of ZnSO4 in agar gel medium is tested by varying t he temperature as well as the gel concentration at high concentration of th e electrolyte. The activation energy E and D-0 value decrease with increasi ng gel concentration in agreement with the theory.