## solids and liquids in the rxn quotient

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

### solids and liquids in the rxn quotient

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

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

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

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

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

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

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

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

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.