Problem: Sketch the galvanic cells based on the following overall reactions. Show the direction of electron flow, and identify the cathode and anode. Give the overall balanced equation. Assume that all concentrations are 1.0 M and that all partial pressures are 1.0 atm.a. Cr3+ (aq) + Cl2 (g) ⇌ Cr2O72- (aq) + Cl - (aq)

FREE Expert Solution

We’re being asked to sketch a galvanic cell for the following reaction:

Cr3+ (aq) + Cl2 (g)  Cr2O72- (aq) + Cl - (aq)


Recall that a voltaic or galvanic cell is an electrochemical cell that is spontaneous and produces electricity


From the reaction, we can see that the oxidation state of Cr went from +3 (Cr3+) to +6 (Cr2O72-) which means it was oxidized or lost electrons


The anode (–) half-reaction is:

2 Cr3+(aq) + 7 H2O(l)  Cr2O72-(aq) + 14 H+(aq) + 6e-

6 e to the product side


The other half-reaction is then reduced or gained electrons


The cathode (+) half-reaction is:

Cl2(g) + 2 e  2 Cl-(aq)

2(–1) + 8(+1) + x = 0

2 e to the reactant side


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Problem Details

Sketch the galvanic cells based on the following overall reactions. Show the direction of electron flow, and identify the cathode and anode. Give the overall balanced equation. Assume that all concentrations are 1.0 M and that all partial pressures are 1.0 atm.

a. Cr3+ (aq) + Cl2 (g) ⇌ Cr2O72- (aq) + Cl - (aq)

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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 McCamant's class at UR.

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.