Lab 10 Postlab

# Lab 10 Postlab - 1 13.5/13.5 points Last Response | Show...

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1. 13.5/13.5 points Last Response | Show Details All Responses Notes Complete the following table. The measured potentials are your experimental data. Use the table of Standard Reduction Potentials . 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 1.27 [1.27] V 1.53 [1.53] V 16.99 [17] Pb-Zn .381 [0.381] V .63 [0.63] V 39.52 [39.5] Cu-Zn .869 [0.869] V 1.10 [1.10] V 21 [21] 2. 4/4 points Last Response | Show Details All Responses Notes 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. [x] [x] Any action that makes [Zn 2+ ] smaller than [Pb 2+ ].

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