In Zubrick’s chapter "The Theory of Extraction, he shows you mathematically why several smaller extractions are more efficient than one big one. The solubility data for benzoic acid is: 10 g/100 mL ether and 1g/100 mL water. What is the partition coefficient, Kp? If you have 300 mL of an aqueous solution containing 1.80 g of benzoic acid, prove that 3 successive extractions using 40 mL of ether each time is more efficient (92% of benzoic acid extracted) than using just one 120 mL extraction (which captures only 80% of the benzoic acid in the ether layer).