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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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Whelan Whelan
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8 years ago
When suspected drunk drivers are tested with a Breathalyzer, the alcohol (ethanol) in the exhaled breath is oxidized to acetic acid with an acidic solution of potassium dichromate:

3 CH3CH2OH(aq) + 2 Cr2O7-2 (aq) + 16 H+(aq) 3CH3CO2H(aq) + 4Cr+3(aq) + 11H2O (l)

What is the value of E for the reaction when the concentrations of ethanol, acetic acid, Cr2O7-2, and Cr+3, are 1.0M and the pH is 4.00? (Eº for this cell is 1.30V and the temperature is 298K).
Equations to solve this problem are below.

ε = ε° -   lnQ

ε = 1.30 -   ln

A) 1.62 V
B) 1.30 V
C) 0.98 V
D) 1.24 V
Textbook 
Introductory Chemistry Essentials

Introductory Chemistry Essentials


Edition: 5th
Author:
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hbutler2hbutler2
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