lab 10 postlab

# lab 10 postlab - Complete the following table The measured...

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Complete the following table. The measured potentials are your experimental data. Use the Reduction_Table to determine the calculated potentials. Use the Zn 2+ /Zn potential as the reference in each case. Please enter your potentials in volts. Hint: Use the Nernst Equation where necessary. The percent difference is defined as: [ (Calculated Potential - Measured Potential) / Calculated Potential ] x 100. Note that, defined in this way, percent differences can be positive or negative. Cell Measured Potential Calculated Potential % difference Ag-Zn 1.180 V 1.53 V 22.88 Pb-Zn .2926 V .63 V 53.56 Cu-Zn .7952 V 1.10 V 27.71 If you wanted to shift the potential of the lead-zinc cell upward, toward 0.70 V, which of the following actions would give the desired result? Check all that apply. Any action that makes log Q negative. Any action that makes [Zn 2+ ] smaller than [Pb 2+ ]. Adding some concentrated Zn(C 2 H 3 O 2 ) 2 solution to the Zn 2+ /Zn couple. Any action that makes Q < 1.0.

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