# Problem: Design a voltaic cell from the following half-reactions: Cr 2O 7(aq) + 14 H +(aq) + 6 e − → 2 Cr 3+ (aq) + 7 H 2O(l)              E  o = 1.33 O 2(g) + 4 H +(aq) + 4 e − → H 2O(l)                                                 E     o = 1.23 In the overall reaction, how many H + ions would be shown and which side would they be on? A. 18 on the left B. 16 on the left C. 10 on the left D. 10 on the right E. 12 on the right

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Design a voltaic cell from the following half-reactions:

Cr 2O 7(aq) + 14 H +(aq) + 6 e − → 2 Cr 3+ (aq) + 7 H 2O(l)              E  o = 1.33

O 2(g) + 4 H +(aq) + 4 e − → H 2O(l)                                                 E     o = 1.23

In the overall reaction, how many H + ions would be shown and which side would they be on?

A. 18 on the left

B. 16 on the left

C. 10 on the left

D. 10 on the right

E. 12 on the right

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.

What is the difficulty of this problem?

Our tutors rated the difficulty ofDesign a voltaic cell from the following half-reactions: Cr...as medium difficulty.

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Based on our data, we think this problem is relevant for Professor Beauvais' class at POINTLOMA.