Multiple Choice
Which of the following statements is true for a salt bridge?
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16. Oxidation and Reduction
Galvanic Cell (Simplified)
Multiple Choice
What is the balanced half reaction that occurs at the anode in the overall cell reaction of a voltaic cell?
3 MnO4–(aq) + 5 Fe(s) → 3 Mn2+(aq) + 5 Fe3+(aq)
A
MnO4–(aq) + 8 H+(aq) + 5 e– → Mn2+(aq) + 4 H2O(l)
B
2 MnO4–(aq) + 12 H+(aq) + 6 e– → 2 Mn2+(aq) + 3 H2O(l)
C
Fe(s) →Fe3+(aq) + 3 e–
D
Fe(s) →Fe2+(aq) + 2 e–
E
Fe2+(aq) → Fe3+(aq) + e–
Verified step by step guidance1
Identify the overall cell reaction: 3 MnO4–(aq) + 5 Fe(s) → 3 Mn2+(aq) + 5 Fe3+(aq).
Determine the oxidation and reduction processes. Oxidation occurs at the anode, where Fe(s) is oxidized to Fe3+(aq).
Write the oxidation half-reaction for iron: Fe(s) → Fe3+(aq) + 3 e–.
Verify the number of electrons lost in the oxidation half-reaction matches the number of electrons gained in the reduction half-reaction.
Ensure the half-reaction is balanced in terms of mass and charge, confirming that Fe(s) → Fe3+(aq) + 3 e– is the correct balanced half-reaction at the anode.
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