Q vs. K

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sallina_yehdego 2E
Posts: 75
Joined: Sun Apr 29, 2018 3:00 am

Q vs. K

Postby sallina_yehdego 2E » Mon Jan 14, 2019 11:05 pm

What's the difference between Q and K??

Madeline Ho 1C
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Joined: Mon Apr 23, 2018 3:00 am

Re: Q vs. K

Postby Madeline Ho 1C » Mon Jan 14, 2019 11:08 pm

K is the equilibrium constant while Q is the reaction quotient. So when you calculate Q, the reaction is not necessarily at equilibrium, though the equation to solve for Q and K are the same. You can then compare the values of Q and K to determine which direction the reaction will go.

I am Sodium Funny
Posts: 65
Joined: Fri Sep 28, 2018 12:26 am

Re: Q vs. K

Postby I am Sodium Funny » Mon Jan 14, 2019 11:11 pm

K is a value for the the rate of the reaction at equilibrium.

Q is a meusurement of the the rate of the reaction at any given time. But we know that the reaction will always try to attain equilibrium so the value of Q will be driven towards K.

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Anna O 2C
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Joined: Fri Sep 28, 2018 12:19 am

Re: Q vs. K

Postby Anna O 2C » Tue Jan 15, 2019 12:38 pm

Q is calculated in the same way as K, only it can be taken at anytime during the reaction instead of K which is exclusively valued at the time of equilibrium. Because Q is the same ratio as K, you can utilize its value in relation to K to determine where the reaction lies in its accordance to the given equilibrium.

Henry_Phan_4L
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Joined: Fri Sep 28, 2018 12:24 am

Re: Q vs. K

Postby Henry_Phan_4L » Tue Jan 15, 2019 1:29 pm

Can Q fluctuate around K so that it could be higher at one point and lower at another point?

A De Castro 14B 2H
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Joined: Fri Sep 28, 2018 12:29 am

Re: Q vs. K

Postby A De Castro 14B 2H » Tue Jan 15, 2019 2:12 pm

Henry_Phan_4L wrote:Can Q fluctuate around K so that it could be higher at one point and lower at another point?


I believe that Q can fluctuate around K, depending on the specific given time you measure Q. For instance, if you measure Q a few seconds after products are added to the system, Q will be greater than K (the system will shift to the left). On the other hand, if you measure Q a few seconds after reactants are added to the system, Q will be less than K (the system will shift to the right).


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