Finding K

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Mya Majewski 1L
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Joined: Fri Sep 25, 2015 3:00 am

Finding K

Postby Mya Majewski 1L » Thu Feb 25, 2016 5:28 pm

When given the K of the reverse reaction and concentrations of the forward. How do you find the overall K? Also, how do you know whether the reaction is favoring the products or the reactants?

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Re: Finding K

Postby Chem_Mod » Thu Feb 25, 2016 6:12 pm

Could you give an example in which the problem is like what you are describing?

Charlene Tang 1B
Posts: 25
Joined: Fri Sep 25, 2015 3:00 am

Re: Finding K

Postby Charlene Tang 1B » Thu Feb 25, 2016 6:15 pm

I'm going to assume the K for the overall reaction is the K for the forward reaction.

If you're given the K (equilibrium constant) for the reverse reaction, all you need to do is just 1/Kreverse to get the Kforward.

If K is large (or just >1), then concentration of the products is larger than that of the reactants (since K=[products]/[reactants]), and we can assume that product formation (or the forward reaction) is favored. If K is small (<1), then the concentration of reactants is larger than that of the products. So reactant formation is favored and the reverse reaction is favored.

Hope this helps!

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