Electrochemistry: Voltaic Cells lab report data analysis

timer Asked: Apr 8th, 2015

Question description

Data Analysis

1.  (Part I) Compare the average cell potential, for your Cu/Pb cell, with the E°cell that you calculated in the pre-lab exercise. Explain why your cell potential is different from the text value.

2.  (Part II) The unknown metals X and Y were either magnesium, silver, or zinc. Use the text value for the reduction potential of Pb and the measured cell potentials for the unknowns to identify X and Y.

3.  (Part III) Use the Nernst equation to calculate the theoretical value of E of the copper-concentration cell and compare this value with the cell potential that you measured.

4.  (Part III) Use the Nernst equation and the information that you collected about the Pb/PbI2 cell to complete the following calculations.

a.  Use the cell potential for the Pb-PbI2 cell and the known [Pb2+] to calculate the [Pb2+] in equilibrium with PbI2.

b.  Use the original diluted [Pb2+] and [I] to calculate the [I] in solution.

c.  Use your data to calculate the Ksp of PbI2.

d.  The accepted value of the Ksp of PbI2 is 9.8 × 10–9. How does your experimental Ksp of PbI2 compare with the accepted value?

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