Electrochemistry: reference electrode

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SUMMARY

The discussion focuses on the use of the calomel electrode (ESCE=0.24V) in conjunction with the copper half-cell reaction, specifically the reduction half-reaction Cu2+ + 2e- → Cu(s). Participants confirm the correctness of the half-cell reactions and emphasize the importance of combining them to derive the overall cell reaction. Additionally, they discuss the methodology for determining cell potential by marking the potentials of both half cells and drawing a potential line to visualize the distance between them.

PREREQUISITES
  • Understanding of electrochemical cells and half-reactions
  • Familiarity with the calomel electrode and its standard electrode potential
  • Knowledge of reduction and oxidation processes in electrochemistry
  • Ability to interpret electrochemical potential diagrams
NEXT STEPS
  • Study the Nernst equation for calculating cell potentials
  • Learn about different types of reference electrodes, including Ag/AgCl
  • Explore the concept of standard reduction potentials and their applications
  • Investigate the impact of concentration on cell potential using the Nernst equation
USEFUL FOR

Chemistry students, electrochemists, and researchers involved in electrochemical analysis and cell design will benefit from this discussion.

AdityaDev
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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:
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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.
 
Borek said:
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.
 
You have already listed both half cell reactions. If you need a full one, just combine them.
 
Borek said:
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.
 
No such thing as Cl in the second reaction, but I guess it is just a typo.
 
Borek said:
No such thing as Cl in the second reaction, but I guess it is just a typo.
Sorry its cl-
 

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