Reaction Quotient

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Gabriel Ordonez 2K
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Joined: Sat Jul 20, 2019 12:15 am

Reaction Quotient

Postby Gabriel Ordonez 2K » Sun Jan 12, 2020 8:26 pm

Can someone please explain the importance of the reaction quotient and what on earth it is? I have a general idea, but I tend to confuse it with the likes of Kc and Kp. Thank you!

Jacob Puchalski 1G
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Joined: Fri Aug 09, 2019 12:16 am

Re: Reaction Quotient

Postby Jacob Puchalski 1G » Sun Jan 12, 2020 8:29 pm

The reaction quotient is the proportion of the molarity of the products to the reactants at any given time of the reaction. It's pretty much the same as Kc and Kp but those two are measured specifically at equilibrium.

AArmellini_1I
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Joined: Fri Aug 09, 2019 12:15 am

Re: Reaction Quotient

Postby AArmellini_1I » Sun Jan 12, 2020 8:36 pm

It really doesn't have a ton of application in real-life scenarios so you really just need to understand it as it applies to the homework

Connor Chappell 2B
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Joined: Wed Feb 20, 2019 12:16 am

Re: Reaction Quotient

Postby Connor Chappell 2B » Mon Jan 13, 2020 4:56 pm

The Reaction quotient Q is a number representative of what stage a reaction is at relative to its equilibrium conditions. Q can be used as a checkpoint in such a manner and will allow us to make predictions about which direction the reaction will tend to proceed. In order to do this, K will usually be known in regards to a certain reaction, and we can compare the Q that we calculate to see which direction the reaction will proceed.

EMurphy_2L
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Joined: Sat Sep 07, 2019 12:16 am

Re: Reaction Quotient

Postby EMurphy_2L » Mon Jan 13, 2020 4:59 pm

We only use the reaction quotient in this class to be able to compare it to the equilibrium constant and see if more reactants or products will form as the vessel sits. It's derived in the same way as K (as the person above said)

Tiffany_Chen 2K
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Joined: Fri Aug 30, 2019 12:15 am

Re: Reaction Quotient

Postby Tiffany_Chen 2K » Mon Jan 13, 2020 5:19 pm

Reaction quotient is used to determine whether the equation is at equilibrium (so compare to the K value). If not, we can predict which direction the reaction needs to favor in order to reach the equilibrium rate for both sides.

AKatukota
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Joined: Thu Jul 25, 2019 12:18 am

Re: Reaction Quotient

Postby AKatukota » Mon Jan 13, 2020 6:26 pm

The reaction quotient , Q, is pretty much used and compared to K to determine the direction the reaction will proceed in. If Q<K, then products favored. If Q>K then the reactants favored.

alicechien_4F
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Joined: Sat Jul 20, 2019 12:15 am

Re: Reaction Quotient

Postby alicechien_4F » Mon Jan 13, 2020 7:06 pm

I think it is easy to mix up Q and K because they're calculated the same way! However, Q is used to calculate the ratio between products and reactants at any given time, while K is used to calculate the ratio between products and reactants exactly at equilibrium. Q will always proceed towards K in order to reach equilibrium.

Joanne Lee 1J
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Joined: Thu Jul 25, 2019 12:15 am

Re: Reaction Quotient

Postby Joanne Lee 1J » Wed Jan 15, 2020 4:07 pm

The reaction quotient is the ratio of products to reactants at any time during the experiment but K is the ratio of products to reactants at equilibrium only. The reaction quotient will often tell you if the reaction is at equilibrium or which side (left or right) it favors.

Sally Qiu 2E
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Joined: Fri Aug 30, 2019 12:18 am

Re: Reaction Quotient

Postby Sally Qiu 2E » Wed Jan 15, 2020 4:08 pm

if the reaction is not at equilibrium, or if you aren't sure, then you are calculating the reaction quotient. It is the same equation as K. it can be used, when compared to K, to determine which way the reaction is proceeding

Madelyn Romberg 1H
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Joined: Tue Oct 02, 2018 12:16 am

Re: Reaction Quotient

Postby Madelyn Romberg 1H » Thu Jan 16, 2020 10:17 am

They are measured the same. The key difference is K is ONLY at equilibrium where as Q is at any point in the reaction. Q can tell us which way the reaction will favor when compared to Q.

Uisa_Manumaleuna_3E
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Joined: Wed Sep 21, 2016 2:56 pm

Re: Reaction Quotient

Postby Uisa_Manumaleuna_3E » Thu Jan 16, 2020 3:11 pm

Reaction quotient is just you looking at the same system, at a certain point in time, and comparing it to what it should be at equilibrium. If they match up, great! your system's chilling at equilibrium. If not, you can see the direction in which its progressing to equilibrium.


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