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Katie Bart 1I
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Joined: Sat Aug 24, 2019 12:16 am


Postby Katie Bart 1I » Wed Jan 08, 2020 11:44 pm

Why are solids and liquids not included in calculating the equilibrium constant? Are only gases and aqueous solutions considered in the K value?

BritneyP- 2c
Posts: 101
Joined: Sat Sep 14, 2019 12:15 am

Re: solids/liquids

Postby BritneyP- 2c » Wed Jan 08, 2020 11:49 pm

solids are not considered because they don't have a concentration, they have density. Liquids do not affect the reactant amount at equilibrium, so they are not considered in the equilibrium constant.

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Re: solids/liquids

Postby Christineg1G » Thu Jan 09, 2020 9:11 am

Gases and aqueous solutions would only be used and considered in equilibrium expressions since the concentration of pure solids and liquids does not change.

Caitlyn Tran 2E
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Re: solids/liquids

Postby Caitlyn Tran 2E » Thu Jan 09, 2020 9:43 am

Another way to think about this is that the equilibrium constant is the ratio between the products and the reactants. Since the concentration of a solid (since solids do not have a concentration) and the concentration of a pure liquid/solvent do not change, including them in the ratio would mean that the same value would be put in the numerator and denominator, thus causing them to cancel each other out. Hence, we just leave these out when calculating K.

Joanne Lee 1J
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Joined: Thu Jul 25, 2019 12:15 am

Re: solids/liquids

Postby Joanne Lee 1J » Thu Jan 09, 2020 1:05 pm

Solids and liquids are not counted in the equilibrium constant because the concentration does not change in either the products or reactants. Therefore, yes only gases and aqueous solutions are included when trying to find K.

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