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Assuming x is negligible

Posted: Mon Nov 27, 2017 9:41 pm
by Cynthia Tsang
When can you assume that, in your ICE table, x is negligible and can be removed from your equilibrium constant equation?

Re: Assuming x is negligible

Posted: Mon Nov 27, 2017 9:46 pm
by Naveed Zaman 1C
There are certain conditions where K is a specific value that can allow you to ignore "x" because it is small, but I don't think Dr. Lavelle has taught us this and won't expect us to know it for testing purposes.

Re: Assuming x is negligible

Posted: Mon Nov 27, 2017 9:48 pm
by MorganYun1H
I think he addressed this question on one of the modules. If K is less than 10^-3, that's when you can assume x is negligible.

Re: Assuming x is negligible

Posted: Mon Nov 27, 2017 9:50 pm
by Lianna Kishi 1A
I was wondering this too but I know for homework problem 11.51 x is negligible for the reactants because their equilibrium concentration (when calculated with proper sigfigs) rounds off to be the same as their initial concentration.