Fall 09. Exam2

Fall 09. Exam2 - CHEMISTRY 2101 Fall 2009 Dr. Philippe...

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CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Hour Exam II November 6, 2009 Page 1 HOUR EXAM II There are 5 pages with problems to this exam. Put your name (or initials on subsequent pages) at the top of EACH PAGE ! Show your work! Problem Points Possible 1 20 2 25 3 10 4 20 5 25 Total 100 We will correct everything that we can read— promised! Answer the whole question! Manage your time! Move on if you get stuck with a problem. h = 6.6262 10 -34 J s 1 eV = 1.6022 10 -19 J At 25 ºC: ln(10) RT/F = 2.303 RT/F = 59.16 mV
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CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Hour Exam II November 6, 2009 Page 2 (1) (20 points in total) An electrochemical cell Consider an electrochemical cell with a standard hydrogen electrode on the left hand side, a silver wire inserted into a solution of Ag + (2.00 mM) on the right hand side, and a 1 M lithium acetate (LiOAc) salt bridge. (a) (10 points) Give a line notation for this electrochemical cell. (b) (10 points) Calculate the half-cell potential at 25 o C for the right hand side of the cell discussed in (a). You may assume all activity coefficients to be 1.
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CHEMISTRY 2101 Name___________________________ Fall 2009 Dr. Philippe Buhlmann Hour Exam II November 6, 2009 Page 3 (2) (25 points) A Redox Titration The concentration of Sn 2+ in a 50 mL sample was determined in a redox titration at 25 o C. The titrant was a 0.010 M solution of Ce 4+ . A volume of 25 mL of titrant was necessary to reach the equivalence point. You may assume all activity coefficients to be 1. The two half reactions and the net reaction in this redox titration are as follows: Sn 4+ + 2 e -  Sn 2+ 0.14 V Ce 4+ + e -  Ce 3+ 1.61 V (a) (5 points) What was the original concentration of the Sn 2+ in the sample?
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This note was uploaded on 10/02/2011 for the course CHEM 2101 taught by Professor Bulman during the Spring '11 term at Minnesota.

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Fall 09. Exam2 - CHEMISTRY 2101 Fall 2009 Dr. Philippe...

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