Use the References to access important values if needed for this question. Enter

Question

Use the References to access important values if needed for this question. Enter electrons as e-. Use smallest possible integer coefficients. States are not required. If a box is not needed, leave it blank. Standard Reduction Potentials (Volts) at 25 °C

I2 (s) + 2 e- 2 I- (aq) 0.535

O2(g) + 4 H3O+(aq) + 4 e- 6 H2O(l) 1.229

2 H2O(l) + 2 e- H2(g) + 2 OH-(aq) -0.828

Fe2+ (aq) + 2 e- Fe (s) -0.440

A 0.169 M neutral aqueous FeI2 solution is electrolyzed under 1 atm pressure using platinum electrodes. (a) Write the half-reactions expected to occur, taking into account the effect of the non-standard conditions on the electrode potentials.

Half-reaction at anode:

Half-reaction at cathode:

(b) What is the expected decomposition potential? V

Explanation / Answer

With the given data,

(a) Half-reaction at anode : 2I- ---> I2 + 2e-

Half-reaction at cathode : Fe2+ + 2e- --> Fe

(b) Expected decomposition potential = -0.440 - 0.535 = -0.975 V

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