Effect of Temperature on Chemical Equilibrium

[Karan Punjabi]

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.

 

[Buzz Bloom]

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

 

[DrClaude]

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).

 

[DrClaude]

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.

No, K is the rate constant. See my post.

 

[Chestermiller]

You are asking why the equilibrium constant is a function of temperature, but not pressure or concentration, correct?

 

[Karan Punjabi]

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

 

[Chestermiller]

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?

 

[Karan Punjabi]

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

 

[Chestermiller]

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

 

[Karan Punjabi]

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☺