Exam1key - Chemistry 241 Exam 1 May 18, 2010 Honor Pledge:...

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Chemistry 241 Exam 1 May 18, 2010 Honor Pledge: I have neither given or received help on this exam, nor have I seen anyone else do so. ______________________________(Signed) 1. 2. 3. 4. 5. 6. 7. 8. 9. Total ________ 15 10 10 10 10 10 10 10 15 100 SHOW YOUR WORK CIRCLE NUMERICAL ANSWERS 1.(15pts) What chromatographic technique would be best for the following analyses? (Be as specific as possible.) a) separating the polar involatile disinfection by-products in drinking water. Normal phase HPLC b) separating compounds responsible for the aroma of red wine. Gas Chromatography c) determine the specific presence of cocaine in urine. Affinity Chromatography d) separating sodium and potassium in a blood sample. Ion Exchange Chromatography e) determine the molecular weight of the polymer polyethylene glycol. Gel Permeation or Molecular Exclusion or Size Exclusion 2.(10pts) For a given chromatographic column, the constants in the Van Deemter equation are: A = 1.65 mm; B = 25.8 mm mL/min; and C= 0.0236 mm min/mL . What is the height equivalent for a theoretical plate if the mobile phase flow rate is: 30 mL/min? mm CF F B A H 2 . 3 ) 30 )( 0236 (. 30 8 . 25 65 . 1 = + + = + + = 3.(10pts) In a HPLC experiment the peak area of compound X (1.03mg/mL) was 10.86 and the peak area for compound Y (1.16 mg/mL) was 4.37.
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This note was uploaded on 10/11/2010 for the course SPAN 105 taught by Professor Ciyi during the Winter '08 term at University of North Carolina Wilmington.

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Exam1key - Chemistry 241 Exam 1 May 18, 2010 Honor Pledge:...

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