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Unformatted text preview: 4. (3 pts) You have 100 mL of a solution of benzoic acid in water; the amount of benzoic acid in the solution is estimated to be about 0.30 g. The distribution coefficient of benzoic acid in diethyl ether and water is approximately 10. Calculate the amount of acid that would be left in the water solution after a 20-mL extractions with ether. Show all work. 5. (5pts) After recrystallizing benzoic acid (authentic m.p. = 122 o C), you characterize your sample. Your sample has a melting point of 111 o C-116 o C, and according to a TLC developed in 2-propanol, it has only one spot with an R f = 1.0. According to these data, is your compound pure or impure? Explain what information you got from each test and if any of the data conflicts or is not useful....
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