Electrochemistry: reference electrode

  • #1
528
33

Main Question or Discussion Point

Reduction half reaction : Cu2++2e- -> Cu(s)
I have a doubt in using the reference electrode.
For example if I have the calomel electrode (ESCE=0.24V) how do I use it with the copper half cell? Are these reactions correct?
Cu2++2e- -> Cu(s)
2Hg+2Cl -> Hg2Cl2+2e-
To get Ecell=0.24+ECu|Cu2+
 
Last edited:

Answers and Replies

  • #2
Borek
Mentor
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Draw a potential line - just like a horizontal axis of the plot.

Mark potentials of both half cells.

Cell potential is the distance between them.
 
  • #3
528
33
Draw a potential line - just like a horizontal axis of the plot.

Mark potentials of both half cells.

Cell potential is the distance between them.
My question is different. It's about the cell reaction. Not finding the potential from graph.
 
  • #4
Borek
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28,357
2,745
You have already listed both half cell reactions. If you need a full one, just combine them.
 
  • #5
528
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You have already listed both half cell reactions. If you need a full one, just combine them.
My question : Are those reactions correct?
I'll edit the post.
 
  • #6
Borek
Mentor
28,357
2,745
No such thing as Cl in the second reaction, but I guess it is just a typo.
 
  • #7
528
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No such thing as Cl in the second reaction, but I guess it is just a typo.
Sorry its cl-
 

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