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solids and liquids in the rxn quotient

Posted: Sun Feb 09, 2020 12:17 pm
by Maggie Eberhardt - 2H
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)

Re: solids and liquids in the rxn quotient

Posted: Sun Feb 09, 2020 12:26 pm
by Alice Ma 2K
Yes, we always exclude solids and liquids when calculating for Q or K.

Re: solids and liquids in the rxn quotient

Posted: Sun Feb 09, 2020 1:40 pm
by Michellekim1H
We never include solvents/liquids and solids for K and Q. Only aq and g are accepted.

Re: solids and liquids in the rxn quotient

Posted: Sun Feb 09, 2020 2:15 pm
by gabbymaraziti
Yes, liquids and solids are excluded from calculating K or Q.

Re: solids and liquids in the rxn quotient

Posted: Sun Feb 09, 2020 2:51 pm
by Noe BM 1J
Yes, you exclude solids and liquids. You only take into account gases and aqueous solutions when calculating Q and/or K.

Re: solids and liquids in the rxn quotient

Posted: Sun Feb 09, 2020 3:12 pm
by John Liang 2I
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!

Re: solids and liquids in the rxn quotient

Posted: Sun Feb 09, 2020 3:13 pm
by SimranSangha4I
Yes, exclude the two when calculating the Q or K.

Re: solids and liquids in the rxn quotient

Posted: Sun Feb 09, 2020 8:52 pm
by Chris Charton 1B
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.

Re: solids and liquids in the rxn quotient

Posted: Sun Feb 09, 2020 8:58 pm
by Jainam Shah 4I
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.