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Fall 09. Exam2 key

Fall 09. Exam2 key - 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 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. Cu | Pt | H 2 (g, 1 atm), 1 M HCl || LiOAc(1.0 M) || Ag + (2.00 mM) | Ag | Cu [The Cu on the two ends for the copper wire are not required for full score] (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. Ag + + e - == Ag E o = 0.799 V E = E o " 2.303 R T n F # $ % & ( log a red a ox # $ % & ( = 799 mV " 2.303 R T F # $ % & ( log 1 0.002 # $ % & ( = 799 mV + 59.16 mV log 1 0.002 # $ % & ( = 639 mV
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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.
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