Using Q

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Brandon Mo 4K
Posts: 70
Joined: Fri Sep 28, 2018 12:15 am

Using Q

Postby Brandon Mo 4K » Fri Jan 11, 2019 1:43 am

How are we supposed to use Q to determine whether a system is at equilibrium?

Michael Torres 4I
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Joined: Thu May 10, 2018 3:00 am
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Re: Using Q

Postby Michael Torres 4I » Fri Jan 11, 2019 7:39 am

Q is the reaction quotient. You can find Q just as you would find K by finding the ratio aA<>bB as [B]^b/[A]^a.

Q can give you a ratio of products to reactants, which you can then compare to K in order to see where the reaction will head in order to reach equilibrium, expressed as the value of K.

If Q is smaller than K, then you know there are more reactants in Q than K. As such, the reaction will produce more products in order to get closer to equilibrium.
If Q is larger than K, then you know there are more products in Q than K. As such, the reaction will produce more reactants in order to get closer to equilibrium.
If Q is equal to K, then the reaction is already at equilibrium. The equilibrium partial pressures or concentrations of the products and reactants will remain the same.


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