galvanic cells

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Sophia Dinh 1D
Posts: 100
Joined: Thu Jul 25, 2019 12:15 am

galvanic cells

Postby Sophia Dinh 1D » Fri Mar 06, 2020 12:10 am

How can you tell which is the anode vs cathode if the cell potential is given?

Jacey Yang 1F
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

Re: galvanic cells

Postby Jacey Yang 1F » Fri Mar 06, 2020 12:16 am

The cathode has the more positive cell potential, the anode has the more negative cell potential.

Daniela Shatzki 2E
Posts: 53
Joined: Sat Aug 24, 2019 12:16 am

Re: galvanic cells

Postby Daniela Shatzki 2E » Fri Mar 06, 2020 12:28 am

if two are given you can't use the formula Ecell = Ecathode - Eanode and then decide which is which based on which arrangement will give you a positive overall value.

Junwei Sun 4I
Posts: 125
Joined: Wed Oct 02, 2019 12:16 am

Re: galvanic cells

Postby Junwei Sun 4I » Fri Mar 06, 2020 2:16 am

If you are given the cell potential then the more positive one is the cathode. Since in a galvanic cell Ecell =Ecathode - Eanode has to be positive.

Juana Abana 1G
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

Re: galvanic cells

Postby Juana Abana 1G » Fri Mar 06, 2020 7:02 am

Daniela Shatzki 2E wrote:if two are given you can't use the formula Ecell = Ecathode - Eanode and then decide which is which based on which arrangement will give you a positive overall value.



Does this work all the time?

Sartaj Bal 1J
Posts: 101
Joined: Thu Jul 25, 2019 12:17 am

Re: galvanic cells

Postby Sartaj Bal 1J » Sat Mar 07, 2020 4:10 pm

A positive potential difference between the electrodes signals that electrons are flowing from the left to the right or from the anode to the cathode, signifying which is which.

Radha Patel 4I
Posts: 97
Joined: Tue Feb 12, 2019 12:15 am

Re: galvanic cells

Postby Radha Patel 4I » Sat Mar 07, 2020 4:15 pm

If the standard cell potential is given then you will know the half reaction is an anode if it is more negative than the half reaction of the cathode. In other words, the more positive Ecell is the cathode and the more negative Ecell is the anode.

VLi_2B
Posts: 99
Joined: Sat Sep 14, 2019 12:15 am

Re: galvanic cells

Postby VLi_2B » Sat Mar 07, 2020 5:06 pm

You want the value to be positive because that means the reaction is spontaneous.

205405339
Posts: 77
Joined: Thu Jul 11, 2019 12:16 am

Re: galvanic cells

Postby 205405339 » Sat Mar 07, 2020 6:11 pm

the half reaction with the more negative reduction potential will be the anode


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