Time to Equilibrium: Reactants vs Products

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Discussion Overview

The discussion centers on the time taken to reach chemical equilibrium, specifically whether this time is the same when starting from reactants versus products under identical conditions. The scope includes theoretical considerations and potential experimental implications.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions if the time to reach equilibrium is the same regardless of starting from reactants or products, expressing an intuitive belief but lacking references or proof.
  • Another participant prompts a consideration of what occurs when the roles of reactants and products are switched.
  • A clarification is provided regarding equilibrium reactions, suggesting that products can also react to regenerate reactants, thus changing the initial conditions of the reaction.
  • A participant expresses difficulty in applying integrated rate laws and equilibrium laws to this question, noting a lack of references in standard texts and contemplating the need for experimental validation.
  • One participant asserts that technically, the time required to reach equilibrium is infinite, implying a theoretical perspective on the concept of equilibrium.
  • Another participant suggests that the approach to determining time to equilibrium may depend on the specific model being used.

Areas of Agreement / Disagreement

Participants express differing views on the time to equilibrium based on starting conditions, with no consensus reached on whether the time is the same or varies. The discussion remains unresolved with multiple competing perspectives presented.

Contextual Notes

Participants acknowledge limitations in their understanding and the need for further investigation, including potential experimental approaches. There is mention of the dependence on specific models for analyzing the time to equilibrium.

Who May Find This Useful

This discussion may be of interest to those studying chemical kinetics, equilibrium reactions, or anyone exploring the theoretical aspects of reaction dynamics.

Miffymycat
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Is the time taken to reach equilibrium the same whether starting from reactants or products, under the same conditions? I think intuitively it is but cannot find a reference or proof.
 
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What happens if you switch the roles of the reactants and the products?
 
How do you mean?
 
I understood you to be talking about an equilibrium reaction ... when the products of a reaction themselves can react ... and, in turn, produce the initial reactants. You can start by mixing the products instead .. in which case they are the initial reactants and the roles have changed.

You should have some model for handling these sorts of reactions ... so have you tried applying the model both ways?
Put another way: I am trying to encourage you to investigate your question yourself instead of looking for some results obtained by someone else.

(But you could be thinking of something else.)
 
Thankyou for the clarification - I see what you meant.

I have thought at quite some length and a colleague of mine is equally at a loss. I am familiar withj the basics of integrated rate laws and the equilibrium law, but just cannot see how to apply this. I have found no reference to this question iun several standard texts, so, short of doing an experiment in the lab (which would only prove it for one case), I am lost! If you have an idea how to prove this, then by all means just give me some clues ... I am happy to wrestle with it once I have a direction to go in!

Many thanks
 
Technically time required to reach equilibrium is infinite.
 
@Borek: Depends on your model :)

@Miffymycat: how would you normally go about figuring the time to equilibrium?
 

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