what is the observation when bromine diffusion experiment takes place in 5 degree Celsius
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Answer:
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Explanation:
The self-diffusion constant of bromine in AgBr has been measured in the temperature range 332–415°C, where DBr varies from 2·6 × 10−12 to 4·5 × 10−10 cm2/sec. A plot of DBr versus 1T shows a definite curvature; —RdlnDd(1T) increases from 45,000 cal/mole at the lower end to 60,000 cal/mole at the upper end of this range. DBr has also been measured in 1·27 per cent cadmiumdoped AgBr and found to be smaller by 15–30 per cent, the effect of cadmium being smaller at the lower temperature. These results do not fit into a simple theory of chemical equilibrium, and two alternative mechanisms of association between defects are invoked for an explanation. A number of experiments carried out under hydrostatic pressure give an activation volume for diffusion of ∾ 44 cm3/mole, which supports the assumption that bromine diffuses by a vacancy mechanism.