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<big><font size="2"><big>Look a the "Laboratory" link on my class
web page for help<br>
for exp 2 (dTf). Do this before lab, while writing up your
procedure.<br>
<br>
You will need to collect some temperature data which will not<br>
wind up on the report sheet. Make allowances for this in your<br>
notebook. You'll see this in the "Data to Collect" section of<br>
the lab manual. Those sheets have three lines for the f.p. in<br>
each step. You're suppose to do at least 3 f.p.
determinations<br>
but it may require more. You need to do determine the f.p.<br>
multiple times until you get three freezing points which are<br>
w/in + or - 0.1 degC. Thus, it may require more than three<br>
attempts.<br>
<br>
When you see that last bit of solid cyclohexane melt (the<br>
glassy looking solid) if you see any little solid particles
floating<br>
around that's your solute which has come out of solution.<br>
That f.p. determination is no good. You need to redissolve<br>
the solute and try again.<br>
<br>
Dr. Zellmer</big></font></big>
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