[CHM 112] Quiz Solution Posted

[Andrew J. Pounds]

The solution to quiz 9 is now posted on the class website.

While most of you did significantly better than the last quiz, there 
were a few things that concerned me.

1. In the first problem you were adding a weak acid and its conjugate 
base together to make a buffer.  There was therefore, unlike the last 
quiz, no need to subtract from the amount of weak acid placed in the 
solution.  In the last quiz we added a STRONG base that consumed some of 
the weak acid and made the conjugate base -- that was not the case in 
the present quiz.

2. If you have excess acid or base in your system then you are outside 
of the buffer region and Henderson-Hasselbalch equation is not applicable.


-- 
Andrew J. Pounds, Ph.D.  (pounds_aj at mercer.edu)
Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627
http://faculty.mercer.edu/pounds_aj

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