Calculating K

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Beatrice Petelo 1F
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Joined: Fri Sep 28, 2018 12:17 am

Calculating K

Postby Beatrice Petelo 1F » Sat Jan 12, 2019 2:09 pm

When calculating for K, do we use the initial or equilibrium concentrations?

Lauren Ho 2E
Posts: 70
Joined: Tue Oct 09, 2018 12:16 am

Re: Calculating K

Postby Lauren Ho 2E » Sat Jan 12, 2019 2:11 pm

You would use equilibrium concentrations

Irene Zhou 1E
Posts: 73
Joined: Fri Sep 28, 2018 12:18 am

Re: Calculating K

Postby Irene Zhou 1E » Sat Jan 12, 2019 3:13 pm

Always use equilibrium concentrations to calculate K because K is the equilibrium constant.

Kevin Tang 4L
Posts: 83
Joined: Fri Sep 28, 2018 12:28 am

Re: Calculating K

Postby Kevin Tang 4L » Sat Jan 12, 2019 3:38 pm

The current concentration is denoted as Q, whereas the equilibrium concentration is denoted as K.

Using the value K, we can tell if the reactants or the products are favored. If K>0, then the products are favored and if K<0, then the reactants are favored. If Q>K, that means that there are too many products and if Q<K then there are too many reactants.

Please correct me if I'm wrong thanks!

Posts: 57
Joined: Fri Sep 28, 2018 12:27 am

Re: Calculating K

Postby maldonadojs » Sat Jan 12, 2019 7:54 pm

In this case, you would use the equilibrium concentration because the initial insinuates that the reverse reaction has not happened yet. So we are calculating what the concentrations when equilibrium will return.

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