Direction of a Reaction

[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?

[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.

[chaggard]

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

[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.

[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.

[Shibhon_Shepard]

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

[Tony Chung 2I]

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

[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.

[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.