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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.