# What is Kc?

What does Kc show and how do you calculate it?

Posted Wed 14th November, 2012 @ 12:56 by Phoebe Lam

Hello Phoebe,

So Kc is known as the Equilibrium Constant, and it is a ratio comprised of the products in an equilibrium equation divided by the reactants in that respective equation.

So for example the reaction below:

CH3COOH +C2H5OH <-> CH3COOHC2H5 + H20

The Kc equation would look like this:

[CH3COOHC2H5][H2O] / [CH3COOH][C2H5OH] = Kc

Given that you have the concentration of each respective reactant, you can work out the value of Kc.

If kc >1 then the reaction produces more product (product favoured), and the opposite applies.

Remember Kc is unaffected by changes in concentration, pressure and the action of a catalyst. It only changes with temperature, and that depends on the enthalpy sign associated with the reaction.

I hope this helps Phoebe good luck in your studies.

Answered Wed 14th November, 2012 @ 13:03 by Ryan janjuha
Edited by Ryan janjuha on Wed 14th November, 2012 @ 13:03