Calculating Kc for A+B-->C With B=0 at Equilibrium

Thread starter supercalaf123
Start date Mar 17, 2015
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Equilibrium

AI Thread Summary

In the discussion, the focus is on calculating the equilibrium constant Kc for the reaction A + B → C, particularly when A is in excess and B approaches zero at equilibrium. The key point raised is whether Kc can be simplified to Kc = [C]/[A] due to [B] being effectively zero. This leads to the concern about the mathematical validity of the expression, as multiplying zero by any number results in zero, which raises questions about the feasibility of the calculation. The discussion emphasizes the importance of understanding how to properly express Kc when one of the reactants is negligible at equilibrium.

Mar 17, 2015

supercalaf123

If I'm trying to find the Kc for A + B --> C and we know that A is in excess, pushing the reaction to the right. At equilibrium, B is 0 essentially. My question is for calculating Kc = [C]/[A][ B ] do we use the equation Kc = [C]/[A] because [ B ]is essentially 0 at equilibrium?

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Mar 17, 2015

Borek

Mentor

So you are saying

0 \times large~number = large~number

Does it look like something that can be true?

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