## ICE

Ariana Murillo 2O
Posts: 21
Joined: Tue Jul 19, 2016 3:00 am

### ICE

While doing practice problems, when do you take the x out of the denominator?

Jennifer_Lam_1A
Posts: 21
Joined: Wed Sep 21, 2016 2:56 pm

### Re: ICE

I think you're referring to when approximating x. You omit the x in the denominator just to approximate x. Once you find the x, divide it by the molarity given. If it is smaller than 5%, it is a good approximation. I hope that answers your question!

EmmaSaid3C
Posts: 22
Joined: Fri Jul 22, 2016 3:00 am

### Re: ICE

You can generally take out the x when the k value is less than 10^-5.

Jeannie_Kim_1I
Posts: 23
Joined: Fri Jul 15, 2016 3:00 am

### Re: ICE

If the k value is equal to 10^-5, would we keep the x in the denominator and use the quadratic equation?

904779609
Posts: 12
Joined: Wed Sep 21, 2016 2:57 pm

### Re: ICE

You're in the clear to approximate without using x if it is 10^-5, 10^-6 and so on. If it is 10^-3 you leave x and use the quadratic equation. But if it is 10^-4 you can take out x and to be sure you would then check if you're in the 5% range.

Skolli20
Posts: 35
Joined: Wed Sep 21, 2016 2:58 pm

### Re: ICE

I also just want to mention what another student told me today at a review session. You can't just blindly approximate if you see the Ka or Kb value is 10^-5. Take the extra 2 minutes and make sure that it is actually 5% because if the initial value is smaller than 10^-5 it will mess up your calculations.