October 09, 2024, 08:48:24 AM
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Topic: What can go into the equilibrium constant expression?  (Read 728 times)

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Offline Santiago_1989

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What can go into the equilibrium constant expression?
« on: September 22, 2024, 06:54:11 AM »
Hi everyone!

When writing the equilibrium constant expression for a reaction, we do not include pure solids and pure liquids. Does it apply to the homogenous equilibria as well? What if we have this reaction

A(l) + B(l) --> C(l) + D(l), in this reaction, both the reactants and products are in a pure liquid state. What will be the Kc expression for this reaction?

Offline Hunter2

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Re: What can go into the equilibrium constant expression?
« Reply #1 on: September 22, 2024, 07:36:52 AM »
Assume all liquids soluble each other then you have mixture of all 4 in the total volume.
c(A) = V(A)/V (tot), c(B) = V(B)/V (tot), c(C) = V(C)/V (tot), c(D) = V(D)/V (tot),

K can be expressed then.

Offline Borek

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Re: What can go into the equilibrium constant expression?
« Reply #2 on: September 22, 2024, 10:54:57 AM »
A(l) + B(l) --> C(l) + D(l), in this reaction, both the reactants and products are in a pure liquid state

Assuming they are all immiscible and insoluble in each other, which would be quite something.
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