Standard cell potential vs cell potential


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204635822
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

Standard cell potential vs cell potential

Postby 204635822 » Tue Feb 09, 2016 10:28 am

I am unsure when to find E and when to find Enot. Sometimes the problem asks for potential difference, but expects you to use Enot although it did not say standard.

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

Re: Standard cell potential vs cell potential

Postby Stefanie Bui 1J » Tue Feb 09, 2016 3:49 pm

E is usually called the cell potential, and E0 is usually referred to as the potential difference or standard cell potential!

Hope this helps!

204635822
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

Re: Standard cell potential vs cell potential

Postby 204635822 » Tue Feb 09, 2016 5:15 pm

Thank you!

ssendhil
Posts: 27
Joined: Fri Sep 25, 2015 3:00 am

Re: Standard cell potential vs cell potential

Postby ssendhil » Tue Feb 09, 2016 5:22 pm

When we find the half reactions and add the E knot values we get E knot of the cell. E values are usually given by the problem for the purposes of calculating Q (or concentrations) in the formula E= E,knot - (RT/nF)•lnQ . Usually if they do not give you the E value then they give you enough information in context to find it. Hope this helps!


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