We’re being asked to determine which combination of these half-cell reactions leads to the cell reaction with the smallest positive cell emf.
Recall that the standard cell potential, E°cell or emf is given by the equation:
To do so, we need to do the following:
Step 1. Determine the half-cell potentials (refer to the Standard Reduction Potential Table)
Step 2. Identify the oxidation half-reaction (anode) and the reduction half-reaction (cathode)
Step 3. Calculate E°cell for each combination of half-cell reactions
Determine which combination of these half-cell reactions leads to the cell reaction with the smallest positive cell emf.
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