equilibrium constants and inputs

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Dina Marchenko 2J
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Joined: Thu Jul 25, 2019 12:16 am

equilibrium constants and inputs

Postby Dina Marchenko 2J » Mon Jan 13, 2020 8:37 pm

When finding Kc, why do we ignore liquids and solids? What values do we assume the concentrations of liquids or solids to be once the reaction goes through? (ie- when we see a liquid in an equation, do we assume its molarity will be almost equal to 1 and that's why we ignore it? and why assume that it's 1?)

Jordan Young 2J
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Joined: Thu Jul 25, 2019 12:17 am
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Re: equilibrium constants and inputs

Postby Jordan Young 2J » Mon Jan 13, 2020 8:59 pm

Solids don't have concentrations because it doesn't make sense for it to have one. Liquids/solvents in reaction generally do not change much in terms of concentration so we assume that the value stays the same and will be on both sides of the reaction so it has no effect on the equilibrium constant.

Joowon Seo 3A
Posts: 100
Joined: Sat Aug 24, 2019 12:17 am

Re: equilibrium constants and inputs

Postby Joowon Seo 3A » Tue Jan 14, 2020 9:11 am

Solids cannot have a concentration. Liquids are not included in the equation since their concentration essentially does not change so we leave it out.

Celine 1F
Posts: 120
Joined: Fri Aug 02, 2019 12:16 am

Re: equilibrium constants and inputs

Postby Celine 1F » Tue Jan 14, 2020 9:17 am

Solids don't have a concentration and liquids are considered pure substances and their concentration does not change

Lauren Tanaka 1A
Posts: 109
Joined: Sat Aug 17, 2019 12:18 am

Re: equilibrium constants and inputs

Postby Lauren Tanaka 1A » Tue Jan 14, 2020 12:23 pm

We ignore liquids and solids since their concentrations do not change. We can then leave them out of the equations when we are solving for the K value.


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