Relationship Between Ecell and K

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zfinn
Posts: 106
Joined: Fri Aug 30, 2019 12:16 am

Relationship Between Ecell and K

Postby zfinn » Tue Mar 03, 2020 10:50 pm

what's the relationship between Ecell and the value of K? (i.e. if K > 1 or K <1)

Max Madrzyk Dis 4G
Posts: 102
Joined: Wed Sep 18, 2019 12:21 am

Re: Relationship Between Ecell and K

Postby Max Madrzyk Dis 4G » Tue Mar 03, 2020 11:32 pm

I think the higher the value of K, the higher the value of Ecell.

Justin Quan 4I
Posts: 104
Joined: Sat Sep 14, 2019 12:17 am

Re: Relationship Between Ecell and K

Postby Justin Quan 4I » Mon Mar 09, 2020 1:46 pm

If E˚ is positive, then K>1; if E˚ is negative, then K<1. This will always hold true. It may also be important to note that whenever E˚ is positive, then ∆G˚ is negative, and vise versa.

Alfred Barrion 2H
Posts: 100
Joined: Sat Jul 20, 2019 12:16 am

Re: Relationship Between Ecell and K

Postby Alfred Barrion 2H » Mon Mar 09, 2020 1:48 pm

When Ecell > 0, then K>1.
When Ecell < 0, then K<1

Kallista McCarty 1C
Posts: 212
Joined: Wed Sep 18, 2019 12:18 am

Re: Relationship Between Ecell and K

Postby Kallista McCarty 1C » Mon Mar 09, 2020 2:08 pm

K is greater than 1 if Ecell is greater than 0. K is less than 1 if Ecell is less than 0

Jessica Chen 2C
Posts: 103
Joined: Thu Jul 11, 2019 12:17 am

Re: Relationship Between Ecell and K

Postby Jessica Chen 2C » Wed Mar 11, 2020 10:44 am

I agree with all the previous responses, and it makes sense if you think about the meaning of these values. Ecell can describe spontaneity (spontaneous if the value is positive, not spontaneous if the value is negative) while K, the equilibrium constant, describes whether the reaction is product or reactant favored. We can see that spontaneous reactions will have more product (Ecell>0 and K>1) while nonspontaneous reactions will have more reactants (Ecell<0 and K<1).

Julia Holsinger_1A
Posts: 50
Joined: Tue Feb 26, 2019 12:16 am

Re: Relationship Between Ecell and K

Postby Julia Holsinger_1A » Wed Mar 11, 2020 4:59 pm

Ecell and K are positively related so the larger the K means a more positive Ecell

Pegah Nasseri 1K
Posts: 100
Joined: Wed Feb 27, 2019 12:15 am

Re: Relationship Between Ecell and K

Postby Pegah Nasseri 1K » Wed Mar 11, 2020 5:09 pm

Looking at the two equations E˚= (RT/nF)lnK and Ecell = E˚- (RT/nF)lnQ, you can see that if K>1 then E˚> 0. When E˚>0, then Ecell will be a greater value and will most likely be greater than zero as well. So if K>0 then E˚>0 and Ecell>0.

Bryan Chen 1H
Posts: 58
Joined: Mon Jun 17, 2019 7:24 am

Re: Relationship Between Ecell and K

Postby Bryan Chen 1H » Wed Mar 11, 2020 10:36 pm

I remember my TA writing Ecell>0 than K>0 and vice versa, and you can prove this from the equations

Celine 1F
Posts: 120
Joined: Fri Aug 02, 2019 12:16 am

Re: Relationship Between Ecell and K

Postby Celine 1F » Thu Mar 12, 2020 2:08 pm

Ecell and K are positively related


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