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Direction of a Reaction

Posted: Thu Jan 24, 2019 1:41 am
by Dustin Shin 2I
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?

Re: Direction of a Reaction

Posted: Thu Jan 24, 2019 2:44 am
by gwynlu1L
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.

Re: Direction of a Reaction

Posted: Thu Jan 24, 2019 11:09 am
by chaggard
The problem will always either give you K or the comments to calculate K. Q is useless without knowing K.

Re: Direction of a Reaction

Posted: Fri Jan 25, 2019 5:56 pm
by Sean Reyes 1J
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.

Re: Direction of a Reaction

Posted: Wed Feb 20, 2019 3:34 am
by Xingzheng Sun 2K
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.

Re: Direction of a Reaction

Posted: Wed Feb 20, 2019 1:45 pm
by Shibhon_Shepard
if Q>K , the reaction moves to the reactants.
if Q<K, the reaction moves to the products

Re: Direction of a Reaction

Posted: Sat Feb 23, 2019 4:02 pm
by Tony Chung 2I
They should give you the value of k or they'll give you the correct values to solve for k.

Re: Direction of a Reaction

Posted: Mon Mar 11, 2019 11:06 pm
by Alysa Rallistan 2G
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.

Re: Direction of a Reaction

Posted: Mon Mar 11, 2019 11:06 pm
by Alysa Rallistan 2G
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.