Separations KEY (v-1.1)

Separations KEY (v-1.1) - Third Exam Chem 241 November 29,...

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1 E = electric field strength = volts/cm Third Exam November 29, 2010 Name: _____KEY-1 _________________ Chem 241 Professor Jorgenson (please print full name) Honor Code Pledge: _____________________________ ( s i g n a t u r e ) R S 2t 2 t 1 W 1 W 2 V R V M KV S H L N A B u Cu 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 R S N 2 2 S 1 1 16R N t' r t r t m I 100 n N n Log t' X Log t' n Log t' N Log t' n velocity 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 1 2 t t
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2 Name: _______KEY-1 ______________________ (please print full name) Answer Page: Using BLOCK CAPITAL LETTERS write the letter of your answer to each problem in the space provided below 1. _____ 2. _____ 3. _____ 4. _____ 5. _____ 6. _____ 7. _____ 8. _____ 9. _____ 10. _____ 11. _____ 12. _____ 13. _____ 14. _____ 15. _____ 16. _____ 17. _____ 18. _____ 19. _____ 20. _____ The following three problems make use of the information in the graph below. pH 01 4 2 4 6 8 10 12 A B C D i s t r b u o n R a 0 5 10 15 20 The chart above shows the behavior of a three substances distributing between diethyl ether and an aqueous phase. Using this chart, answer the following questions: 1. Substance C is: A) an acid with pKa=13 B) a base with pKa=13 C) a base with pKa=10 D) an acid with pKa=6.5 E) a base with pKa=6.5 F) an acid with pKa=10 2. Substance A is: A) a base with K=18.5 B) an acid with K=18.5 C) a base with K=3.5 D) an acid with K=3.5 E) a base with K=9 F) an acid with K=9
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3 pH 12 aqueous solution containing A, B and C extract with ether first aqeuous fraction first ether fraction extract with ether second ether fraction final aqueous fraction reduce pH of aqueous fraction to 8 3. All three substances, A, B and C, are mixed together in an aqueous solution and separated following the flow chart shown above. Which substance is found in each fraction?
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Separations KEY (v-1.1) - Third Exam Chem 241 November 29,...

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