Aqueous and Gaseous Phases

Moderators: Chem_Mod, Chem_Admin

Deap Bhandal L1 S1J
Posts: 77
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 2 times

Aqueous and Gaseous Phases

Postby Deap Bhandal L1 S1J » Tue Nov 21, 2017 1:28 pm

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.

Lucian1F
Posts: 87
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

Re: Aqueous and Gaseous Phases

Postby Lucian1F » Tue Nov 21, 2017 1:59 pm

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.

Mishta Stanislaus 1H
Posts: 45
Joined: Fri Sep 29, 2017 7:04 am

Re: Aqueous and Gaseous Phases

Postby Mishta Stanislaus 1H » Sun Nov 26, 2017 10:05 pm

Could someone please expand on this answer?

Janet Nguyen 2H
Posts: 51
Joined: Fri Sep 29, 2017 7:05 am

Re: Aqueous and Gaseous Phases

Postby Janet Nguyen 2H » Sun Nov 26, 2017 10:36 pm

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.


Return to “Equilibrium Constants & Calculating Concentrations”

Who is online

Users browsing this forum: No registered users and 1 guest