Electrode Potential: How & Why It Forms

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Discussion Overview

The discussion centers on the formation of electrode potential at the interface between a metal electrode and its ionic solution. It explores the mechanisms behind this phenomenon, including the dissolution of metal and the resulting charge dynamics.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that electrode potential arises due to the dissolution of metal from the electrode surface, where metal atoms become soluble ions, separating electrons that remain on the electrode.
  • Others argue that electrochemical reactions are heterogeneous and occur at the electrode interface, suggesting that the potential is localized there.
  • A later reply challenges the assertion that electrochemical reactions only occur at the electrode interface, noting that reactions can also happen in the solution with both reduced and oxidized substances present.
  • One participant questions how a metal can dissolve into its own solution, indicating a need for further clarification on this process.
  • A chemical reaction involving sodium and water is presented, though its relevance to the discussion of electrode potential is not explicitly connected.

Areas of Agreement / Disagreement

Participants express differing views on the nature of electrochemical reactions and the specifics of how electrode potential forms, indicating that multiple competing views remain without a clear consensus.

Contextual Notes

Some claims rely on assumptions about the nature of electrochemical reactions and the definitions of terms like "heterogeneous." The discussion does not resolve these assumptions or clarify the scope of the reactions mentioned.

amaresh92
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why the electrode potential arise at the electrode in contact with its ionic solution?
 
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In its most basic form, the case of a metal electrode, some metal dissolves from the electrode surface. In doing so, insoluble metal atoms become soluble metal ions. That process involves separating electrons from those atoms. The ions go off into solution and the electrons remain behind on the electrode. The electrons give the electrode a negative charge.
 
Because electrochemical reactions are heterogeneous. The reactions will only occur at the electrode interface so of course the electrode potential is found at the interface.
 
Topher925 said:
Because electrochemical reactions are heterogeneous.

That's too strong a statement, they can occur as well in the solution, when both reduced and oxidized substances are dissolved.
 
Matcon said:
In its most basic form, the case of a metal electrode, some metal dissolves from the electrode surface. In doing so, insoluble metal atoms become soluble metal ions. That process involves separating electrons from those atoms. The ions go off into solution and the electrons remain behind on the electrode. The electrons give the electrode a negative charge.

but how can a metal dissolve to its own solution.
 
2Na + H2O -> 2NaOH + H2
 

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