written practice exam - Cornell University Chemistry 2510...

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Cornell University Chemistry 2510 Examination April 23, 2009 Instructions: Read all questions completely before answering. You may find it helpful to first read through the entire exam and then answer those questions that you find easier and later return to those you find more difficult. Please follow the directions for each question as answers that are not written where or how it is specified in the question will lose all credit. Good Luck!!! Name:___________________________________________________ Signature:________________________________________________ Problem Score Possible 1 20 2 10 3 15 4 13 5 20 6 20 7 20 8 20 9 26 10 16 11 10 12 10 Total 200
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Page 1 of 16 1) ( 20 ) a) An aqueous solution containing 5.0 g of solute in 100 mL is extracted with three 33-mL portions of diethyl ether, where the distribution coefficient ( K ) (aka the partition coefficient) is 10 ( K = 10). What is the total amount of solute that will be extracted after the three extractions? You must fully show work to get any credit. b) The original aqueous solution in (a) above is instead extracted one time with a 99- mL portion of diethyl ether. What is the total amount of solute that will be extracted in this single extraction? You must fully show work to get any credit.
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Page 2 of 16 2) ( 10 ) The solubility of acetanilide in hot water (5.5g/100mL @100 o C) is not great, and its solubility in cold water (0.53g/100mL at 0 o C) is significant. What would be the maximum theoretical recovery (first crop only) from the crystallization of 5 g of acetanilide from 100 mL of water? You must show all work to receive any credit.
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This note was uploaded on 02/08/2010 for the course CHEM 2510 taught by Professor Russo,s during the Fall '07 term at Cornell University (Engineering School).

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written practice exam - Cornell University Chemistry 2510...

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