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Topic: electric potentials... confused  (Read 3924 times)

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Offline HgWonder

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electric potentials... confused
« on: September 07, 2008, 03:59:12 PM »
I am trying to figure out the change in potential when you use a 0.1M solution of KCl instead of a saturated (3.5M) KCl solution in a Calomel electrode.

Pt|Hg|Hg2Cl2|KCl  [0.242V vs NHE]

I applied the Nernst Equation but I wasn't sure if I was calculating this difference properly.  Thanks.   



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Offline Borek

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Re: electric potentials... confused
« Reply #1 on: September 07, 2008, 04:33:03 PM »
Show the equation you are using.
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Offline HgWonder

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Re: electric potentials... confused
« Reply #2 on: September 07, 2008, 04:53:10 PM »


Red= 3.5
Ox= 0.1
Eo= 0.242
R= 8.314472
T= 298.15
z= 1
F= 96485.309

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Offline Borek

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Re: electric potentials... confused
« Reply #3 on: September 07, 2008, 05:37:07 PM »
No, that's wrong. First of all - what is electrode reaction? Second - what is Hg22+ concentration? How does it depend on [Cl-]?
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