Problem: Write balanced half-reactions for the following redox reaction: 6I2(s) + C2H5OH(l) + 12 OH-(aq) → 12 I- (aq) + 2 CO2(g) + 9 H2O(l) reduction: oxidation:

FREE Expert Solution

Step 1

I2 (aq)  I- (aq)

C2H5OH (l)  CO2 (g)


Step 2

I2 (aq)  2 I- (aq)

C2H5OH (l)  2 CO2 (g)


Step 3

I2 (aq)  2 I- (aq)

C2H5OH (l) + 3 H2O (l)  2 CO2 (g)


Step 4

I2 (aq)  2 I- (aq)

C2H5OH (l) + 3 H2O (l)  2 CO2 (g) + 12 H+ (aq)


Step 5

I2 (aq) + 2 e-  2 I- (aq)

C2H5OH (l) + 3 H2O (l)  2 CO2 (g) + 12 H+ (aq) + 12 e-


Step 6

[I2 (aq) + 2 e-  2 I-(aq) ] x 6

C2H5OH (l) + 3 H2O (l)  2 CO2 (g) + 12 H+ (aq) + 12 e-


Step 7

6 I2 (aq) + 2 e- (aq)  12 I- (aq)

C2H5OH (l) + 3 H2O (l) + 12 OH- (aq)  2 CO2 (g) + 12 H+ (aq) + 12 e- +  12 OH- (aq)


Step 8

6 I2 (aq) + 2 e- (aq)  12 I- (aq)

C2H5OH (l) + 3 H2O (l) + 12 OH- (aq)  2 CO2 (g) + 12 e- + 12 H2O (l)


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Problem Details

Write balanced half-reactions for the following redox reaction: 

6I2(s) + C2H5OH(l) + 12 OH-(aq) → 12 I- (aq) + 2 CO2(g) + 9 H2O(l) 

reduction: 

oxidation: