Separations Practice Problems

Separations Practice Problems - Additional Practice...

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1 E = electric field strength = volts/cm Additional Practice Problems: SEPARATIONS Chem 241-Section 1 Spring 2008 Professor Jorgenson R S = 2t 2 t 1 ( ) W 1 + W 2 V R = V M + KV S H = L N = A + B u + Cu α = K 2 K 1 = k' 2 k' 1 = t 2 t m t 1 t m m m r M S M M S S t t t V V K V C V C k' = = = D = KH + [] K a + H + [ ] D = KK a K a + H + [ ] t r = t m 1 + k' () = L u 1 + K V S V M Q n = V 1 V 1 + KV 2 n K = C organic C aqueous K = C stationary C mobile 1 4 k' 1 k' 1 4 N R ave 2 S + = γ N N = 16R S 2 1 2 1 + k' ave k' 2 2 t' r = t r t m I = 100 n + N n Log t' X Log t' n ( ) Log t' N Log t' n velocity = µ apparent E apparent = ep + eo 2 H 2 r 2 B 2 r 2 t 2 r W t 5.55 W t 16 t N = = = σ 1 2 t t =
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2 0 5 10 D (distribution ratio) pH 7 5 3 9 11 13 AB C D 1. The chart above shows the behavior of a group of weak acids distributing between diethyl ether and an aqueous phase. Using this chart, answer the following questions: A) What is the partition coefficient, K, for compound D? B) What is the acid dissociation constant, K a , for compound A? C) All four of these compounds are present in an aqueous solution. Based on the information in this chart, describe the extraction procedure you would use to isolate compound B from all the other compounds in this mixture.
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3 2. Benzoic acid is a weak acid with a pK a = 4.20. The partition coefficient of benzoic acid between ether and water is 13.8, favoring ether.
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This note was uploaded on 08/27/2011 for the course CHEM 101 taught by Professor Smith during the Spring '11 term at East Carolina University .

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Separations Practice Problems - Additional Practice...

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