Effect of Temperature on Chemical Equilibrium

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Discussion Overview

The discussion revolves around the effect of temperature on chemical equilibrium, specifically focusing on Le Chatelier's principle and the behavior of the equilibrium constant (K) in relation to temperature, pressure, and concentration. Participants explore theoretical aspects and seek clarification on why K changes with temperature but remains constant with changes in concentration and pressure.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant expresses confusion about why the equilibrium constant changes with temperature, unlike its behavior with concentration and pressure.
  • Another participant suggests that the rate constant is influenced by temperature according to the Arrhenius equation, noting that this temperature dependence does not apply to pressure and concentration.
  • Several participants seek clarification on the relationship between temperature and the equilibrium constant, with some reiterating the question about why K varies with temperature.
  • A participant mentions that understanding this relationship requires knowledge of chemical thermodynamics, which the original poster has not yet studied.

Areas of Agreement / Disagreement

Participants generally agree on the premise that the equilibrium constant is affected by temperature, but there is no consensus on the detailed explanation or understanding of the underlying principles, particularly due to varying levels of knowledge among participants.

Contextual Notes

Some participants reference external sources for definitions and explanations, but there are limitations in the discussion due to the lack of formal education in chemical thermodynamics by some participants, which may affect their understanding of the concepts discussed.

Who May Find This Useful

This discussion may be useful for students studying chemical equilibrium, particularly those interested in the effects of temperature on equilibrium constants and the principles of Le Chatelier's principle.

Karan Punjabi
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Guys, I'm studying about Le-chatelier's principle and the topic is effect of temperature. I just went through it and found a difficulty that why K values changes i.e why the equilibrium constant changes as in other effects like changes in concentration, pressure,etc the K values remains constant.
 
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Hi Karan:

I looked at the Wikipedia article
https://en.wikipedia.org/wiki/Le_Chatelier's_principle
and I found no equations involving a variable "K". So, I assume that by "K value" you mean temperature.

I can make some wild guesses about the problem you are asking about, but in order to help you I need to see the context of the question, with quoted material for the source if possible.

Regards,
Buzz
 
In the simplest model the rate constant is given by the Arrhenius equation, see https://en.wikipedia.org/wiki/Reaction_rate_constant

The higher the temperature, the easier it is for the reactants to overcome the reaction barrier. No such dependence of the rate constant exists for pressure and concentration. That said, they still have to be considered in Le Châtelier's principle (although pressure only for gases).
 
You are asking why the equilibrium constant is a function of temperature, but not pressure or concentration, correct?
 
Chestermiller said:
You are asking why the equilibrium constant is a function of temperature, but not pressure or concentration, correct?
I understood you Drclaud. And I want the same thing mentioned above that is why Equilibrium constant is a function of temperature . why it doesn't varies with changes in concentration and pressure
 
Karan Punjabi said:
I understood you Drclaud. And I want the same thing mentioned above that is why Equilibrium constant is a function of temperature . why it doesn't varies with changes in concentration and pressure
I take that as a yes. Have you had a course in chemical thermodynamics yet?
 
Chestermiller said:
I take that as a yes. Have you had a course in chemical thermodynamics yet?
No, I'm in FYJC so no knowledge of thermodynamics
 
Karan Punjabi said:
No, I'm in FYJC so no knowledge of thermodynamics
Well, when you take chemical thermodynamics, you will learn about the derivation of the equilibrium constant and why it is a function of temperature alone. The coursework leading up to this is just too lengthy to describe here.

chet
 
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Chestermiller said:
Well, when you take chemical thermodynamics, you will learn about the derivation of the equilibrium constant and why it is a function of temperature alone. The coursework leading up to this is just too lengthy to describe here.

chet
Ohk thanks for the help☺
 

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