Calculating Chemical Equilibrium

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Monica Diaz 2B
Posts: 21
Joined: Fri Sep 25, 2015 3:00 am

Calculating Chemical Equilibrium

Postby Monica Diaz 2B » Sun Nov 08, 2015 12:57 pm

Can someone explain why solids and liquids are not included in the equation constant?

JuliaPark2H
Posts: 19
Joined: Fri Sep 25, 2015 3:00 am

Re: Calculating Chemical Equilibrium

Postby JuliaPark2H » Sun Nov 08, 2015 1:53 pm

Hi Monica,
based on a chemistry lecture I found from a source from University of Texas, one way to comprehend why solids and liquids aren't included in equilibrium calculations is because pure solids and liquids don't have changing concentrations-- they're always considered to be 1. On the other hand, concentrations of gases or solvents change (molarity, gas concentrations,...)

This is the explanation that I found satisfactory, but if anyone else can provide another clarification, I'd also like to know!

amyjunus1A
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Re: Calculating Chemical Equilibrium

Postby amyjunus1A » Sun Nov 08, 2015 3:26 pm

I believe what Dr. Lavelle mentioned in his last lecture was how even if you were to add the Concentrations of Solids and Liquids, they would not change (from product to reactant and vice versa) because they are pure. Hence they would cancel each other out in the equation when calculating the Equilibrium Constant. Hope that helps!


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