# Problem: What is the balanced half‐reaction that occurs at the anode in the unbalanced overall cell reaction of a voltaic cell: 3 MnO4– + 5 Fe (s) → 3 Mn2+ + 5 Fe3+ a) MnO 4- (aq) + 8H (aq) + 5e - → Mn2+ (aq) + 4H 2 O(l)  b) 2MnO 4- (aq) +12H+ (aq) + 6e - → 2Mn2+ (aq) + 3H 2 O(l) c) Fe(s) → Fe3+ (aq) + 3e - d) Fe(s) → Fe2+ (aq) + 2e - e) Fe2+ (s) → Fe3+ (aq) + e -

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###### Problem Details

What is the balanced half‐reaction that occurs at the anode in the unbalanced overall cell reaction of a voltaic cell:

3 MnO4+ 5 Fe (s) → 3 Mn2+ + 5 Fe3+

a) MnO 4- (aq) + 8H (aq) + 5e - → Mn2+ (aq) + 4H 2 O(l)

b) 2MnO 4- (aq) +12H+ (aq) + 6e - → 2Mn2+ (aq) + 3H 2 O(l)

c) Fe(s) → Fe3+ (aq) + 3e -

d) Fe(s) → Fe2+ (aq) + 2e -

e) Fe2+ (s) → Fe3+ (aq) + e -

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Galvanic Cell concept. You can view video lessons to learn Galvanic Cell. Or if you need more Galvanic Cell practice, you can also practice Galvanic Cell practice problems.

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Based on our data, we think this problem is relevant for Professor Christenson's class at Washington & Jefferson College.