Question

Use the following pair of reduction half-reactions to design a galvanic cell. Then write in the...

Use the following pair of reduction half-reactions to design a galvanic cell. Then write in the proper coefficient for each of the species involved in the overall reaction. Water molecules and protons are not shown in the half-reactions, but may be needed in the overall reaction.

I2 (s) → I- (aq) ξo = 0.54 V

VO2+ (aq) → VO2+ (aq) ξo = 1.00 V

VO2+ (aq)

I2 (s)

VO2+ (aq)

I- (aq)

H+ (aq)

H2O (l)

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Answer #1

I2 (s) → I- (aq) ξo = 0.54 V

VO2+ (aq) → VO2+ (aq) ξo = 1.00 V

Clearly, I2 is going to oxidize so

E° = Ered - Eox = 1-0.54 = 0.46 V

[VO2]+ (aq) = [VO]+2

I- (aq) = I2(s)

balance I

[VO2]+ (aq) = [VO]+2

2I- (aq) = I2(s)

balance O

[VO2]+ (aq) = [VO]+2 + H2O

2I- (aq) = I2(s)

balance H

2H+ +[VO2]+ (aq) = [VO]+2 + H2O

2I- (aq) = I2(s)

balance charges

e- + 2H+ +[VO2]+ (aq) = [VO]+2 + H2O

2I- (aq) = I2(s) + 2e-

balance e--

2e- + 4H+ + 2[VO2]+ (aq) = 2[VO]+2 + 2H2O

2I- (aq) = I2(s) + 2e-

add all

2I- (aq) + 2e- + 4H+ + 2[VO2]+ (aq) = 2[VO]+2 + 2H2O + I2(s) + 2e-

cancel common terms

2I- (aq) + 4H+(aq) + 2[VO2]+ (aq) = 2[VO]+2 + 2H2O(l) + I2(s)

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