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    I am doing an experiment on the effect of changing ethanol concentration on the rate of diffusion of betalain out of beetroot cells. The absorbency of the solution will be measured by a spectrophotometer. The formula for rate of diffusion is supposedly (change in absorbence)/time. But what is the unit for rate of diffusion and does 'time' in the formula refer to time in seconds/minutes/hours?
    Alternatively, should I be using the Beer-Lambert law (A=ebc) instead of the rate of diffusion formula? It would give me concentration of betalain in the solution, but I'm not sure if concentration is more useful than rate of diffusion with regards to this particular experiment..
 
 
 
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