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Calculate the number of mg of caffeine you would extract in each case, 2-10ml extractions vs 1-20ml extraction. The KD value in this case is 4.6 (assume a starting value of 100mg)

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Kd = (org layer)/(water layer)
Don't you have a volume of water. Is the 2-10 mL and 1-20 mL the organic solvent?

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