Chemical Equilibrium

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Alma Cruz 1A
Posts: 21
Joined: Fri Jun 23, 2017 11:40 am

Chemical Equilibrium

Postby Alma Cruz 1A » Wed Jul 19, 2017 3:19 pm

Does chemical equilibrium only work and be applied to when all reactant and products are in gas phase?
Thanks in advance.

Joe Rich 1D
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Joined: Fri Jun 23, 2017 11:39 am
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Re: Chemical Equilibrium

Postby Joe Rich 1D » Wed Jul 19, 2017 8:10 pm

Chemical equilibrium can occur for any chemical reaction, whatever phase the reactants and products are in. Chemical equilibrium only means that the amount of reactants and products are not changing anymore, so this can occur for compounds in any state.

When we calculate the equilibrium constant, though, we only use gases and aqueous compounds in our calculations. We do this because solids do not have a concentration or partial pressure (solids are said to exist in a "pure" state), and liquids (aka solvents) are not thought of having concentrations because they are present in such relatively large quantities in reactions. Therefore, we only use gases and aqueous compounds in calculations.

Also, when calculating partial pressures or Kp, the reactants and products tend to be gases, because aqueous solutions are not characterized by partial pressures as much as gases.

Hope this helps!

Jordan Foster
Posts: 22
Joined: Fri Sep 29, 2017 7:06 am

Re: Chemical Equilibrium

Postby Jordan Foster » Mon Nov 20, 2017 10:24 pm

Chemical equilibrium can work with matter in all states. However, when calculating various concentrations, only gasses and aqueous matter are considered.

Michelle Lee 2E
Posts: 64
Joined: Thu Jul 27, 2017 3:01 am

Re: Chemical Equilibrium

Postby Michelle Lee 2E » Tue Nov 21, 2017 10:15 am

Kp is the denotation for finding the equilibrium constant only through partial pressures. Partial pressures are only through gasses.
Kc is the denotation for a general equilibrium constant that doesn't use partial pressures so if you have a partial pressure equated after experimentation, you have to convert it to a concentration so all the values are consistent in Kc.

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