Hydrogen Electrode

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Abigail Urbina 1K
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Joined: Thu Jul 27, 2017 3:01 am

Hydrogen Electrode

Postby Abigail Urbina 1K » Thu Feb 22, 2018 7:56 pm

In the textbook, it says that a hydrogen electrode is denoted H+(aq)|H2(g)|Pt(s) when it is the right hand electrode in a cell diagram and Pt(s)|H2(g)|H+(aq) when it is the left-hand electrode.

I don't quite understand why they are listed in that order because with respect to which side it is as an electrode. I could use some clarification

YashDeshmukh1D
Posts: 42
Joined: Fri Sep 29, 2017 7:05 am

Re: Hydrogen Electrode

Postby YashDeshmukh1D » Thu Feb 22, 2018 8:33 pm

Converting H+ to H2 is reduction, since the charge of the H goes from +1 to 0. Cathodes undergo reduction, which would mean that this half reaction should be placed on the right side of the salt bridge of the cell diagram.

Converting H2 to H+ is oxidation, since the charge of the H goes from 0 to +1. Anodes undergo oxidation, which would place this half reaction on the left side of the salt bridge of the cell diagram.


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