Voltaic Cells?
Consider the following statements regarding a standard voltaic cell with copper (Cu2+|Cu, E°=+0.34 V), and silver (Ag+|Ag, E°=+0.80 V) half cells. Which are correct? Which are incorrect?
1) In the external circuit, electrons flow from the cathode to the anode.
2) In the salt bridge, positive ions flow into the silver half-cell.
3) The silver electrode serves as the negative pole of the cell.
4) The metallic copper undergoes oxidation.
5) The copper electrode serves as the cathode.
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Ag+ + e- ===> Ag +0.80V
Cu ===> Cu2+ + 2e- -0.34V
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Cu + 2Ag+ ===> Cu2+ + 2Ag +0.46V
1) Incorrect. In any cell, electrons flow from the anode to the cathode over the external circuit.
2) Correct.
3) Incorrect. Cu is the anode. The anode is always the negative electrode.
4) Correct. Oxidation is the loss of electrons and increase in oxidation number.
5) Incorrect. Oxidation always occursat the anode.