solids and liquids in the rxn quotient

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Maggie Eberhardt - 2H
Posts: 97
Joined: Sat Jul 20, 2019 12:16 am

solids and liquids in the rxn quotient

Postby Maggie Eberhardt - 2H » Sun Feb 09, 2020 12:17 pm

When calculating Q, do we exclude solids and liquids as when we calculate K? (I'm mostly referring to problem two on the Pizza Rolls review packet)

Alice Ma 2K
Posts: 52
Joined: Wed Nov 13, 2019 12:26 am

Re: solids and liquids in the rxn quotient

Postby Alice Ma 2K » Sun Feb 09, 2020 12:26 pm

Yes, we always exclude solids and liquids when calculating for Q or K.

Michellekim1H
Posts: 25
Joined: Wed Feb 20, 2019 12:17 am

Re: solids and liquids in the rxn quotient

Postby Michellekim1H » Sun Feb 09, 2020 1:40 pm

We never include solvents/liquids and solids for K and Q. Only aq and g are accepted.

gabbymaraziti
Posts: 111
Joined: Wed Sep 18, 2019 12:19 am

Re: solids and liquids in the rxn quotient

Postby gabbymaraziti » Sun Feb 09, 2020 2:15 pm

Yes, liquids and solids are excluded from calculating K or Q.

Noe BM 1J
Posts: 50
Joined: Sat Sep 07, 2019 12:17 am

Re: solids and liquids in the rxn quotient

Postby Noe BM 1J » Sun Feb 09, 2020 2:51 pm

Yes, you exclude solids and liquids. You only take into account gases and aqueous solutions when calculating Q and/or K.

John Liang 2I
Posts: 102
Joined: Fri Aug 30, 2019 12:18 am

Re: solids and liquids in the rxn quotient

Postby John Liang 2I » Sun Feb 09, 2020 3:12 pm

Yes. The reason being is that liquids and solids are always in excess/change is negligible in the reversible rxns, so their molarities would cancel out in the K equation anyways. hope this helps!

SimranSangha4I
Posts: 99
Joined: Sat Sep 14, 2019 12:17 am

Re: solids and liquids in the rxn quotient

Postby SimranSangha4I » Sun Feb 09, 2020 3:13 pm

Yes, exclude the two when calculating the Q or K.

Chris Charton 1B
Posts: 69
Joined: Mon Jun 17, 2019 7:23 am

Re: solids and liquids in the rxn quotient

Postby Chris Charton 1B » Sun Feb 09, 2020 8:52 pm

Solids and Liquids have an activity level of 1, so even if you include them in the calculations they will have no effect on the results.

Jainam Shah 4I
Posts: 130
Joined: Fri Aug 30, 2019 12:16 am

Re: solids and liquids in the rxn quotient

Postby Jainam Shah 4I » Sun Feb 09, 2020 8:58 pm

Yes exclude the solids and liquids. They usually are in excess as they barely react and the concentration of liquids change very little making the change negligible.


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