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### Drawing ICE box

Posted: Mon Nov 16, 2015 9:51 pm
When drawing the ICE box, how do you know when the change in partial pressure is positive or negative?

### Re: Drawing ICE box

Posted: Mon Nov 16, 2015 11:26 pm
This is when calculating reaction quotient (Qc) is very helpful. Remember, you use the same process to calculate Qc as you do to calculate the equilibrium constant.

As Dr. Lavelle has outlined in class, if the reaction quotient is less than the equilibrium constant, (Qc < Kc) then the reaction will proceed to move to the right side and more products will be formed, therefore the partial pressures of the products increases and the partial pressures of the reactants decreases.

Contrarily, if the reaction quotient is greater than the given equilibrium constant, (Qc > Kc) then the reaction will proceed to move to the left and more reactants will be formed, therefore the partial pressures of the products decreases and the partial pressures of the reactants increases.

Hope that helps!