[CHM 181] Lab Prep for Thursday

[Andrew J. Pounds]

In your lab description it tells you to basically:

1. Melt ~12.5 g of paradichlorobenzene (mass it to the 0.01 g). Try not 
to go over 70 C

2. As it cools, and when the temp drops below 60 C, start recording data

3. Repeat 1 and 2 to collect a second set of data

4. Mass ~1.5 grams of unknown.   To the melted paradichlorobenzene, add 
and dissolve the unknown

5. As it cools, and when the temp drops below 60 C, start recording data

6. Re-melt the solution, cool, and take a second set of data with 1.5 g 
of unknown

7. Add an additional ~1.5 grams of unknown to the solution after 
remelting. Make sure it dissolves

8. As it cools, and when the temp drops below 60 C, start recording data

9. Re-melt the solution, cool, and take a second set of data with 3.0 g 
of unknown


In your lab we are not going to take the second set of data. Looking at 
the steps above we will therefore eliminate steps 3, 6, and 9.  This 
will cut about an hour off of lab.

I will discuss the best practices for collecting data during the pre-lab.

Warning -- this is a stinky lab (you are melting mothballs) and the 
cleanup is a little more involved.  It is getting really nice outide and 
lots of people are wearhing shorts.  Please come to lab appropriately 
clothed.  There will not be time to "run back and change" if you are 
dressed inappropriately -- and thus take a zero on this lab.


-- 
*/Andrew J. Pounds, Ph.D./*
/Professor of Chemistry and Computer Science/
/Director of the Computational Science Program/
/Mercer University/
/1501 Mercer University Drive, Macon, GA 31207 /
/(478) 301-5627/
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