Using Appendix 2A

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Shannon Wasley 2J
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Joined: Fri Sep 29, 2017 7:06 am
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Using Appendix 2A

Postby Shannon Wasley 2J » Sat Mar 17, 2018 2:27 pm

For some of the problems in Chapter 14, we have notice that when comparing two cell potentials from Appendix 2A, the lower or more negative cell potential means that half-reaction is an anode and therefore the more positive one is the cathode. However, in other questions when using Appendix 2A, sometimes the anode has a higher or more positive cell potential than the cathode. Why is this? When should we use the fact that the anode has a more negative cell potential and when should we not?

Scott Chin_1E
Posts: 55
Joined: Sat Jul 22, 2017 3:00 am

Re: Using Appendix 2A

Postby Scott Chin_1E » Sat Mar 17, 2018 10:48 pm

If I understand your question correctly, I think that all this means is that when you add up the cell potential of an anode (which has a positive value) and a cathode (which has a negative value), the cell will be not spontaneous (-E of the cell) and will not be a useful battery.

Angel Gomez 1K
Posts: 36
Joined: Fri Sep 29, 2017 7:04 am

Re: Using Appendix 2A

Postby Angel Gomez 1K » Sat Mar 17, 2018 10:52 pm

For our test, I think we'll have to reverse the half reaction of the anode (where oxidation occurs) to get a cell potential that will result in a positive value.

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