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Aqueous and Gaseous Phases

Posted: Tue Nov 21, 2017 1:28 pm
by Deap Bhandal L1 S1J
If a chemical reaction has both aqueous and gaseous substances, how would you determine K if given the concentrations? Would you use Kp or Kc? Also if using Kc, are gases included? Dr. Lavelle said only solid and liquids were excluded in the calculation.

Re: Aqueous and Gaseous Phases

Posted: Tue Nov 21, 2017 1:59 pm
by Lucian1F
If there are both gases and aqueous molecules in a reaction then you will need to use PV=nRT to find the concentration of the gases, then find Kc.

Re: Aqueous and Gaseous Phases

Posted: Sun Nov 26, 2017 10:05 pm
by Mishta Stanislaus 1H
Could someone please expand on this answer?

Re: Aqueous and Gaseous Phases

Posted: Sun Nov 26, 2017 10:36 pm
by Janet Nguyen 2H
It depends what is given in the problem. If the concentrations of all the reactants, whether gaseous or aqueous, are given, then it is safe to use Kc. If the pressure is given for the gaseous phases, then you would need to use pv=nrt to find the concentrations by first finding n (the number of moles) and then dividing it by the volume of the container, and use Kc. However, we shouldn't be encountering any problems that deal with that equation because I don't think we are touching on it in this class or at least the test.