Standard Hydrogen Electrode

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Kassandra Molina 2B
Posts: 43
Joined: Wed Nov 16, 2016 3:03 am

Standard Hydrogen Electrode

Postby Kassandra Molina 2B » Tue Mar 13, 2018 6:56 pm

What is the best way to identify a cathode and an anode in a cell diagram?
I thought I understood it but I got confused while reading the book. On pg 578 it says that the cell potential will be attributed to the copper electrode because the standard hydrogen electrode is always zero, but for the zinc electrode the hydrogen electrode is the cathode making the zinc the anode?? Both cell reactions are also written the same so how do I tell which one is a cathode and anode?

Samantha Kan 2L
Posts: 30
Joined: Sat Jul 22, 2017 3:00 am

Re: Standard Hydrogen Electrode

Postby Samantha Kan 2L » Tue Mar 13, 2018 7:38 pm

The standard hydrogen electrode is the cathode or the anode depending on what else is in the system (like copper or zinc). How you can tell whether the standard hydrogen electrode is the cathode or anode is based on the cell potential. The cell potential should be positive, so according to the equation E(cell) = E(cathode)- E(anode), you can tell whether or not the standard hydrogen electrode is the cathode or anode.


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