When to disregard -x in equilibrium formula?

Acidity
Basicity
The Conjugate Seesaw

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Jennifer_Wong_1G
Posts: 10
Joined: Fri Jul 15, 2016 3:00 am

When to disregard -x in equilibrium formula?

Postby Jennifer_Wong_1G » Sat Dec 03, 2016 1:29 am

Under what circumstances can we disregard the subtracted "x" from the reactants in the equilibrium formula?

Alexandra Watts 3L
Posts: 14
Joined: Wed Sep 21, 2016 2:56 pm

Re: When to disregard -x in equilibrium formula?

Postby Alexandra Watts 3L » Sat Dec 03, 2016 9:07 am

I think it's after you assume to disregard it and proceed to find out what "x" is. You then calculate it as a percentage of the initial M value. If it's less than 5% of the initial molarity then it's okay to disregard it. If not, use quadratic.

Jocelyn Sandoval 3B
Posts: 26
Joined: Wed Sep 21, 2016 2:59 pm

Re: When to disregard -x in equilibrium formula?

Postby Jocelyn Sandoval 3B » Sat Dec 03, 2016 11:11 am

I think that you can assume x=0 when your Kb,Kb, or Kc value is less than 10^-5?


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