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CHEM 211 Quiz 2 (Electrochemical Cells; Nernst's Equation; Ion Selective Electrodes) Due at 11:00 AM, Wednesday, March 31, 2010 1. Describe galvanic...

Could you please do No. 5C) and if possible explain how to answer such questions with both pressure and concentration.


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CHEM 211 Quiz 2 ( Electrochemical Cells; Nernst’s Equation; Ion Selective Electrodes ) Due at 11:00 AM, Wednesday, March 31, 2010 1. Describe galvanic cells that use the following reactions. In each case, write the anode and cathode half-reactions, and sketch the experimental setup. Label the anode and cathode, identify the sign of each electrode, and indicate the direction of electron and ion flow. Example: Cd (s) + Sn 2+ (aq) Cd 2+ (aq) + Sn (s) (a) 2Al (s) + 3Cd 2+ (aq) 2Al 3+ (aq) + 3Cd (s) (b) Cr 2 O 7 2- (aq) + 6Fe 2+ (aq) + 14H + (aq) 2Cr 3+ (aq) + 6Fe 3+ (aq) + 7H 2 O (l) 2. Write the shorthand (line) notation for galvanic cells that use the following reactions: (a) Fe (s) + Cu (aq) Fe 2+ (aq) + Cu (s) (b) 2Ag + (aq) + Ni (s) 2Ag (s) + Ni 2+ (aq) (c) 3Ce 4+ (aq) + Cr (s) 3Ce 3+ (aq) + Cr 3+ (aq) (d) 2Cu + (aq) + Sn 4+ (aq) 2Cu 2+ (aq) + Sn 2+ (aq) (e) Zn (s) + 2H + (aq) Zn 2+ (aq) + H 2(g) (f) H 2 ( g, 1 atm) + Cu 2+ (1 M) 2H + (1 M) + Cu (s) 3. Write the shorthand notation for the following cells with the following half-reactions: (a) 2H + (aq) + 2 ē H 2(g) Zn (s) Zn 2+ (aq) + 2 ē (b) Cd (s) Cd 2+ (aq) + 2 ē Pb 2+ (aq) + 2 ē Pb (s) (c) Al (s) Al 3+ (aq) + 3 ē C l 2(g) + 2 ē 2Cl (aq)
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4. Write cell reactions for the electrochemical cells that have the following shorthand notations. (a) Al (s) | Al 3+ (aq) || Sn 2+ (aq) | Sn (s) (b) Pt (s) | Fe 2+ (aq) , Fe 3+ (aq) || Ag + (aq) | Ag (s) (c) Co (s) | Co 2+ (aq) || Cu 2+ (aq) | Cu (s) (d) Fe (s) | Fe 2+ (aq) || O 2(g) | H + (aq) , H 2 O (l) | Pt (s) 5. Use the Nernst equation and Standard Reduction Potentials Table in the Harris textbook to calculate E o cell for each of the following cells. (a) Al (s) | Al 3+ (0.18 M) || Fe 2+ (0.85 M) | Fe (s) (b) Ag (s) | Ag + (0.34 M) || Cl (0.098 M) | Cl 2 (g, 0.55 atm) | Pt (s) (c) Pt, H 2 (0.9 atm) | H + (0.1 M) || KCl (0.1 M), AgCl (s) | Ag (s) 6. A galvanic cell represented by the following line notation has E cell = 1.250 V. What must be the [Ag + ] in the cell? Zn (s) | Zn 2+ (1.00 M) || Ag + ( x M) | Ag (s) 7. A galvanic cell is represented as follows: Pt (s) | H 2 (g, 1.00 atm) | H + (aq, pH = 4.60) || Cl (aq, x M) | AgCl (s) | Ag (s) E cell =0.580 V. What is the value of x ? 8. The following cell has a potential of 0.27 V at 25 C: Pt (s) | H 2 (1 atm) | H + ( ? ) || Ni 2+ (1 M) | Ni (s) What is the pH of the solution? 9. When a cell with a fluoride ion-selective electrode was calibrated with fluoride standards, a 0.010 M fluoride solution gave a reading of 0.104V and a 3.2 x 10 -4 M solution gave a reading of 0.194 V. A solution of unknown fluoride activity gave a reading of 0.152 V. What was the fluoride ion concentration of the unknown solution?
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This question was asked on Apr 04, 2010.

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