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Problem Set 1

# Problem Set 1 - CHM 614/714 Problem Set#1 1 Explain what...

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1 CHM 614/714 Problem Set #1 1. Explain what happened in (a), (b), and (c) in the following Figure. 2. In countercurrent distribution, D A = 30, D B = 15, V u.p. = V l.p. (a) What are the p and q for solutes A and B? (b) If we want to ensure the maximums are 10 tubes apart, how many steps of movement (n) should we have? (c) Calculate the location of maximum concentration of solutes A and B. 3. If D = 3.5 (between a organic solvent and water), V r = 1, how many extractions are necessary to leave less than 1% of the solute in aqueous phase? 4. Under what conditions, K = D? 5. If k' i = 100, k' j = 35, is the separation between i and j favored by thermodynamics? 6. Suppose that K = 3.0 and K a = 1.0 x 10 -5 . If 50 mL of 0.010 M aqueous weak acid is extracted with 100 mL of organic solvent, what will be the formal concentration remaining in the aqueous phase at (a) pH 3.0 and (b) 10.0. 7. Plot the curve of pH vs. log D using the data in question 6. 8. The species HB is extractable into chloroform with a distribution coefficient K = [HB] org /[HB] aq = 11.7. In water, the nonextractable species H 2 B + and B - are also formed. The

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Problem Set 1 - CHM 614/714 Problem Set#1 1 Explain what...

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