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What makes the equilibrium constant, constant? Like, I know that Kc is affected by the conditions...

What makes the equilibrium constant, constant?

Like, I know that Kc is affected by the conditions the reaction takes place in, like temperature. But, if I have four sets of data for the same reaction and each results in the calculation of the same Kc, why is that? Does it have anything to do with the fact that each of the four runs' initial concentrations all sum to 3M? Or is it something else?

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Answer #1

According to law of mass action,

=> Rate of reaction of species active mass of the species (Active mass= Molar concentration without any unit).

=> For a general balanced reversible reaction

=> aA+bB=cC+dD

=> rate of forward and backward reactions are

Rf = Kf [A]a[B]b

and

Rb = Kb[C]c[D]d

Kf & Kb are the rate constant for forward and backward reactions.

At Equilibrium Rf = Rb therefore

Kc = Kf/Kb = [C]c[D]d/[A]a[B]b.......................(1)

From equation number 1 we can say that Kc Does not dependent on the initial concentration of the reactant..

Whether the sum is 3M of it can be any number. Because it is a constant number and generally comes from the Experimental data.

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