Kc Value

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Kc Value

Postby 305113590 » Mon Jan 07, 2019 3:33 pm

What does a large Kc value mean besides being product or reactant favored? For example 10^7 versus 10^9. Does it have any relationship to kinetics or something else?

Jerome Mercado 2J
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Re: Kc Value

Postby Jerome Mercado 2J » Mon Jan 07, 2019 4:02 pm

In terms of kinetics, having a large equilibrium constant indicates that the reaction is favored to move forward leading to an increase of products formed. The difference in the amount indicates what reaction will create more of a product at a larger rate.

Diane Kang 2F
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Re: Kc Value

Postby Diane Kang 2F » Mon Jan 07, 2019 4:18 pm

A large Kc value also means that the free energy of the reactants state is greater than the free energy of the products, which means energy will be released as the forward reaction occurs.

Fayez Kanj
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Re: Kc Value

Postby Fayez Kanj » Mon Jan 07, 2019 4:32 pm


Basically, the general rule is that if Kc is larger than 1, the equilibrium lies to the right (products are favored) and the opposite if Kc is less than 1. However, if you have 10^7 and 10^9, both are larger than 1. However, 10^9 is 100x larger than 10^7, so the equilibrium for the reaction with Kc = 10^9 would be further to the right than that of Kc=10^7.

Hope this helps :)

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Re: Kc Value

Postby kamalkolluri » Mon Jan 07, 2019 4:46 pm

Another way to conceptualize this is that in Kc, products are the numerator while reactants are the denominator. If Kc is larger in 1 scenario than another, that means you have more product formed in that scenario. This means the reaction is proceeding forward.

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