[CHM 112] Lab 2 Turn-in Procedures

[Andrew Pounds]

Good soggy morning class...

I got a question last night about the lab you will be turning in 
tomorrow and I want to clarify a couple of things so that you will do 
the calculations correctly.

The lab asks you to report the average mg CaCO3 per tablet.  You do this 
through your analysis of the moles of NaOH used and the initial amount 
of HCl  -- not based on the mass of the tablet.  Report the average and 
deviation on the report form.

Since the tablets can weigh different amounts, I also want you to 
calculate the mg of CaCO3 per gram of tablet (basically divide the mg of 
CaCO3 per tablet by the mass of the tablet.   This will tell you 
something about the purity of the tablet -- and requires you to use the 
mass of the tablet.   This is essentially the pre-lab problem that you did.

Now, in the BIG BOX on the GENERALIZED LAB REPORT FORM cover page I want 
two things
recorded:

1. The average and deviation for the mg CaCO3 per tablet, and
2. The average and deviation for the mg CaCO3 per gram of tablet.

Please record your results as

average ± deviation

So your complete lab report will be comprised of:

1. Generalized Laboratory Report Form Cover Page
2. Filled out report form
3. Copies from Lab Notebook.

with a nice STAPLE in the upper left hand corner!


-- 
Andrew J. Pounds, Ph.D.  (pounds at theochem.mercer.edu)
Associate Professor of Chemistry and Computer Science
Mercer University,  Macon, GA 31207   (478) 301-5627