February 20, 2017

Homework Help: Chemistry

Posted by Xi on Tuesday, November 25, 2008 at 3:49pm.

Hmm... This does not make sense. I learned that anything over 5% error, we cannot accept so we have to use the quadratic formula.

Here is a question I got 5.831%. It didn't use the quadratic formula and it still said to set x=0.

Ka = 6.8x10^-4
HF = 0.2-x
H+ = x
F- = x

x= 0.011662

I take 0.011662 and compare it to the original one which is 0.2.

0.011662/0.2 x100 = 5.83 %

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