2015 Midterm #7


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Lily Wei 1D
Posts: 10
Joined: Fri Sep 25, 2015 3:00 am

2015 Midterm #7

Postby Lily Wei 1D » Tue Feb 09, 2016 8:32 pm

Where could E° for the half reactions be found? The formula/data sheet in the front only gives the E° for Al2O3 -->2Al, not Al3+ -->Al. However, they happen to have the same E° of 1.66V?

Irena Roy 4H
Posts: 40
Joined: Fri Sep 25, 2015 3:00 am

Re: 2015 Midterm #7

Postby Irena Roy 4H » Tue Feb 09, 2016 10:10 pm

In general, the half reactions and their corresponding reduction potentials will be given to us via formula/data sheet. In this case however, it is unnecessary to even know the reduction potentials of the reaction, as the standard cell potential will ultimately be 0 since the two half reactions are the same, and thus will cancel each other out.

Stefanie Bui 1J
Posts: 31
Joined: Fri Sep 25, 2015 3:00 am

Re: 2015 Midterm #7

Postby Stefanie Bui 1J » Tue Feb 09, 2016 10:48 pm

Since this is a concentration cell problem, E0 will be zero. This will always be the case when dealing with concentration cells.


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