Cell Potential Spontaneity


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Jerome Mercado 2J
Posts: 60
Joined: Tue Nov 28, 2017 3:02 am

Cell Potential Spontaneity

Postby Jerome Mercado 2J » Thu Feb 28, 2019 7:28 pm

What is the relationship of Cell potential and spontaneity?

Can looking at the Gibbs Free energy equation show the relationship since it has Cell potential, and knowing that spontaneity is correlated with Gibbs Free energy.

Ana Pedreros
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

Re: Cell Potential Spontaneity

Postby Ana Pedreros » Thu Feb 28, 2019 7:32 pm

When the cell potential is positive the reaction is favorable to occur and therefore spontaneous. This can be related to the equation of Delta G = -nfe n cannot be negative and F is positive therefore a positive cell potential will result in a -delta G making the reaction spontaneous.

Harshita Talkad 4L
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am

Re: Cell Potential Spontaneity

Postby Harshita Talkad 4L » Sat Mar 02, 2019 2:07 am

It is spontaneous when E is positive, which means Gibbs free energy would be negative because when E is positive in delta G=-nFE, delta G will be negative, which once again shows that the reaction is spontaneous.

ryanhon2H
Posts: 60
Joined: Fri Sep 28, 2018 12:28 am

Re: Cell Potential Spontaneity

Postby ryanhon2H » Sat Mar 02, 2019 2:13 am

You have to use the equation ∆G = -nFE. Looking at that relationship, you can see that when E is positive, ∆G is negative, and when E is negative, ∆G is positive. A reaction is spontaneous when ∆G is negative, and thus when E is positive.

Hadji Yono-Cruz 2L
Posts: 64
Joined: Fri Sep 28, 2018 12:26 am

Re: Cell Potential Spontaneity

Postby Hadji Yono-Cruz 2L » Sat Mar 02, 2019 3:19 pm

When cell potential is positive then the forward reaction is spontaneous. When the cell potential is negative then the forward reaction is nonspontaneous.

MadelineHlobik
Posts: 33
Joined: Fri Sep 28, 2018 12:22 am

Re: Cell Potential Spontaneity

Postby MadelineHlobik » Sat Mar 02, 2019 3:24 pm

To understand this, use the equation Delta G= -n f e. So, when e is positive, the equation will still be negative. Thus, Delta G will be negative and spontaneous.

Henry Dudley 1G
Posts: 61
Joined: Fri Sep 28, 2018 12:16 am

Re: Cell Potential Spontaneity

Postby Henry Dudley 1G » Sat Mar 02, 2019 7:04 pm

Is it possible for the cell potential to be negative?

Mhun-Jeong Isaac Lee 1B
Posts: 54
Joined: Fri Sep 28, 2018 12:17 am

Re: Cell Potential Spontaneity

Postby Mhun-Jeong Isaac Lee 1B » Sun Mar 03, 2019 11:39 pm

Responding to an above question, yes it is possible for a cell potential to be negative. That’s why in galvanic cell problems, it is important to make sure it is positive or else it is not a galvanic cell.


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