How can we determine if a reaction is reversible or not?

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Discussion Overview

The discussion centers around determining the reversibility of chemical reactions, specifically focusing on a redox reaction involving zinc and copper ions. Participants explore the nature of the reaction and the conditions under which it may or may not be reversible.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant asks how to determine if the reaction Zn2+ (aq) + 2e- -> Zn(s) is reversible.
  • Another participant points out that the initial post presents a half-reaction and emphasizes the need for the complete reaction to assess reversibility.
  • A later post provides the full reaction, identifying it as the zinc-copper cell redox reaction: Cu2+(aq) + Zn(s) -> Cu(s) + Zn2+(aq).
  • One participant asserts that redox reactions are always irreversible.
  • Another participant counters that redox reactions can be reversible if a reverse potential is applied, as in rechargeable batteries, but states that the given reaction is not reversible as presented.

Areas of Agreement / Disagreement

Participants express differing views on the reversibility of redox reactions, with some asserting they are always irreversible and others suggesting conditions under which they can be reversible. The discussion remains unresolved regarding the specific reaction in question.

Contextual Notes

Participants have not fully clarified the assumptions regarding the conditions under which the reaction may be considered reversible or irreversible, nor have they resolved the implications of applying a reverse potential.

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how can we determine if a reaction is reversible or not?

Zn2+ (aq) + 2e- -> Zn(s)
is this a reversible reaction?

thanks! :biggrin:
 
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That's not even a reaction... it's only a half reaction! Where did the electrons come from? The entire reaction must be shown to answer the question.
 
oops.. this is the full reaction, it's the zinc-copper cell redox reaction.

Cu2+(aq) + Zn(s) -> Cu(s) + Zn2+(aq)
 
Aren't redox reactions always irreversible?
 
They can be reversible if a reverse potential is applied as in rechargeable batteries. As shown, it is not reversible.
 

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