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Electrochemistry Reference Electrodes

  • Thread starter war485
  • Start date
  • #1
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Homework Statement



Change your electric potential readings from a Ag/AgCl system to a RHE (reversible hydrogen electrode) system at pH 7.

For example, 0.3 V vs Ag/AgCl and -0.1 V vs Ag/AgCl

Homework Equations



Ag/AgCl 0.222 Volts
RHE 0 - 0.0591*pH Volts

The Attempt at a Solution



RHE at pH 7 = 0.4137 V

0.3 V vs Ag/AgCl + (0.197 - 0.4137) = 0.08333 V ?
-0.1 V vs Ag/AgCl + (0.197 - 0.4137) = -0.3167 V ?
 

Answers and Replies

  • #2
Borek
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-0.0591*7 is not 0.4137

Not that I am sure about the correct signs, but what you did looks inconsistent.
 
  • #3
92
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ah yes I forgot to put that negative sign on my post. So RHE at pH 7 = 0.4137 V should really be read as RHE at pH 7 = -0.4137 V
everything below that assumed that sign was there in the first place.

Are my signs or thinking inconsistent? I was trying to think of everything in terms of SHE (standard hydrogen electrode), which is marked as 0 V.
 
  • #4
Borek
Mentor
28,402
2,801
What is 0.197?

Edit: I mean, I know what it is, I wonder why you used 0.197 on calculations, but you listed 0.222 earlier.
 
  • #5
92
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I was given 0.222 V.
0.197 V would be for a saturated chloride solution, ooh, oups, that belongs to a followup problem (not relevant to this thread), I see what you mean now. It should say 0.222 V not 0.197 V
 

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