Concentration Cells

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KeiannaPineda1B
Posts: 51
Joined: Mon Jun 17, 2019 7:24 am

Concentration Cells

Postby KeiannaPineda1B » Thu Mar 05, 2020 11:20 pm

Why is standard potential 0v in concentration cells?

EvanWang
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

Re: Concentration Cells

Postby EvanWang » Thu Mar 05, 2020 11:21 pm

Because the reactions are the same on both sides, just going in opposite directions. This means that Ecathode=Eanode, and since Ecell=Ecathode-Eanode, Ecell=0.

Subashni Rajiv 1K
Posts: 101
Joined: Wed Sep 18, 2019 12:16 am

Re: Concentration Cells

Postby Subashni Rajiv 1K » Fri Mar 06, 2020 12:28 am

The concentration difference is what gives the cell a current. At equilibrium, the concentrations are the same on both sides, so there would be no current.

Sanjana Borle 2K
Posts: 111
Joined: Fri Aug 09, 2019 12:15 am

Re: Concentration Cells

Postby Sanjana Borle 2K » Fri Mar 06, 2020 12:34 am

Since the composition of the cells is the same molecule, there would be no difference between E cathode and E anode, making the overall cell potential zero.

chimerila
Posts: 53
Joined: Wed Nov 14, 2018 12:23 am
Been upvoted: 1 time

Re: Concentration Cells

Postby chimerila » Fri Mar 06, 2020 12:51 am

So concentration cells always have a standard potential of 0V?

Jialun Chen 4F
Posts: 108
Joined: Sat Sep 07, 2019 12:16 am

Re: Concentration Cells

Postby Jialun Chen 4F » Fri Mar 06, 2020 1:30 am

Ecellnaught depends on the difference between E cathode and E anode, yet in a concentration cell the two nodes contain the same species, thus making the difference to be 0.


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