Common-ion example 1 in notes

[robert zellmer]

Students often ask many questions about common-ion problems,
mainly how we can do them by treating them as if we add the substances
simultaneously to the beaker (when in reality that's not what we are
doing).  I've attached an explanation as to why we can do these problems
as I did in class.  I did the problem first as it would be done 
following what
is actually physically occurring (adding the common ion to an existing
equilibrium causing it to shift back to the left).  I quickly showed 
this page
and actually told everyone to not try to write down what was on that page.
Next I did it assuming we add everything simultaneously to the beaker.
You will see we get the same results but the 2nd way is a whole lot easier.

Dr. Zellmer
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