Equilibrium Constant

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Equilibrium Constant

Postby haileyramsey-1c » Tue Jan 14, 2020 10:50 pm

Is there ever a situation where a solid, liquid, or aqueous solution would be involved in the equilibrium constant expression? or are they always excluded.

andrewcj 2C
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Joined: Thu Jul 11, 2019 12:17 am

Re: Equilibrium Constant

Postby andrewcj 2C » Tue Jan 14, 2020 10:57 pm

What exactly do you mean by aqueous solution? From what I understand, we include ions in solution in equilibrium constants. However, pure liquids and solids are excluded because they have an activity of 1, and equilibrium constants are technically calculated with activity, not concentration.

Alicia Lin 2F
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Re: Equilibrium Constant

Postby Alicia Lin 2F » Tue Jan 14, 2020 10:58 pm

solids and liquids are always excluded. Aqueous solutions are included though.

Caitlyn Tran 2E
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Joined: Fri Aug 09, 2019 12:15 am

Re: Equilibrium Constant

Postby Caitlyn Tran 2E » Tue Jan 14, 2020 11:28 pm

Like other people said, solids are always excluded since they do not have a concentration while pure liquids are always excluded since they do not change concentrations. In terms of aqueous solutions, the solvent is not included, but the solutes are. You can tell the difference because solvents will be marked as a liquid (l) while dissolved solutes will be marked with (aq). Essentially, whenever you see a molecules with (g) or (aq), include it when calculating the equilibrium constant. Hope this helps!

Eunice Nguyen 4I
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Joined: Sat Aug 17, 2019 12:17 am

Re: Equilibrium Constant

Postby Eunice Nguyen 4I » Wed Jan 15, 2020 2:46 am

Solids and liquids are always excluded when calculating the equilibrium constant, not aqueous though.

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