Direction of a Reaction

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Dustin Shin 2I
Posts: 64
Joined: Fri Sep 28, 2018 12:26 am

Direction of a Reaction

Postby Dustin Shin 2I » Thu Jan 24, 2019 1:41 am

When trying to figure out the direction of a reaction using Q, will the problem always give K? Will there ever be a case where K is not given? And if not, how would one go about solving a problem like that?

gwynlu1L
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

Re: Direction of a Reaction

Postby gwynlu1L » Thu Jan 24, 2019 2:44 am

I believe that these kind of questions would have to give you K, or at least have you solve for K by giving you the equilibrium concentrations to solve like as a first part. You need K to compare Q to, since depending on if Q is greater than or less than K, the rxn will proceed left or right.

chaggard
Posts: 37
Joined: Fri Sep 28, 2018 12:19 am

Re: Direction of a Reaction

Postby chaggard » Thu Jan 24, 2019 11:09 am

The problem will always either give you K or the comments to calculate K. Q is useless without knowing K.

Sean Reyes 1J
Posts: 67
Joined: Fri Sep 28, 2018 12:24 am

Re: Direction of a Reaction

Postby Sean Reyes 1J » Fri Jan 25, 2019 5:56 pm

If the problem didn’t give you K, then the value of Q wouldn’t make sense as you have nothing to compare it to.

Xingzheng Sun 2K
Posts: 62
Joined: Fri Sep 28, 2018 12:29 am

Re: Direction of a Reaction

Postby Xingzheng Sun 2K » Wed Feb 20, 2019 3:34 am

If K is not given, we probably can calculate the K using given information such as concentration. If not, we can not compare K vs Q.

Shibhon_Shepard
Posts: 62
Joined: Wed Nov 15, 2017 3:04 am

Re: Direction of a Reaction

Postby Shibhon_Shepard » Wed Feb 20, 2019 1:45 pm

if Q>K , the reaction moves to the reactants.
if Q<K, the reaction moves to the products

Tony Chung 2I
Posts: 60
Joined: Fri Sep 28, 2018 12:19 am

Re: Direction of a Reaction

Postby Tony Chung 2I » Sat Feb 23, 2019 4:02 pm

They should give you the value of k or they'll give you the correct values to solve for k.

Alysa Rallistan 2G
Posts: 32
Joined: Thu Jan 17, 2019 12:16 am

Re: Direction of a Reaction

Postby Alysa Rallistan 2G » Mon Mar 11, 2019 11:06 pm

If you aren't directly given K, then usually you would have to calculate it in an earlier part of the question and then compare Q to K.

Alysa Rallistan 2G
Posts: 32
Joined: Thu Jan 17, 2019 12:16 am

Re: Direction of a Reaction

Postby Alysa Rallistan 2G » Mon Mar 11, 2019 11:06 pm

If you aren't directly given K, then usually you would have to calculate it in an earlier part of the question and then compare Q to K.


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