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<font face="serif">When you come to lab tomorrow please have ENOUGH
information in your lab notebooks to enable you to complete the
lab. Unlike some other professors, I do not require you to write
the entire procedure in your lab notebook. I do expect you,
however, to have enough information in your lab notebook so that
you can do the lab without having to ask for "procedural"
assistance from Brook on "what to do". Understand, it doesn't
have to be anything elaborate -- but it does need to be reasonably
complete.<br>
<br>
For example, tomorrows notebooks might look like this:<br>
<br>
<b>Pur</b><b>e solid: (part 1)</b><br>
<br>
</font>
<ol>
<li><font face="serif">Set up ringstand and burner with 400ml
beaker to make hot water bath.</font></li>
<li><font face="serif">Use toploading balance to mass
approximately 25 g of paradichloribenzene (read mass to 0.01
g)</font></li>
<li><font face="serif">Quantitatively transfer paradichlorobenzene
to the test tube, attache test tube to clam<br>
</font></li>
<li><font face="serif">Lower into water and start heating. <br>
</font></li>
<li><font face="serif">Once solution melts, remove it from heat,
affix stopper with stirrer and thermometer </font></li>
<li><font face="serif">Watch the temperature, once it falls to 60
degrees start stirring slowly and record the temp every 30
seconds</font></li>
<li><font face="serif">Once the solution is difficult to mix (or
once you have four sequential temperatures that are identical)
stop the experiment</font></li>
<li><font face="serif">Repeat 4 through 7 and collect the second
set of pure solid data.</font></li>
</ol>
<p><font face="serif"><b>Adding unknown solid (part </b><b>2</b><b>)</b><br>
</font></p>
<ol>
<li><font face="serif">Use toploading balance to mass
approximately 3 grams of unknown ( read mass to 0.01 g)</font></li>
<li><font face="serif">Quantitatively transfer massed unknown solid
to test tube containing paradichlorobenzene.</font></li>
<li><font face="serif">Do 4 through 8 of part 1 (now with the unknown
solid included) to collect two sets of data. <br>
</font></li>
</ol>
<font face="serif"><b>A</b><b>dding more unknown solid (part 3)</b><br>
</font><font face="serif"><br>
</font>
<ol>
<li><font face="serif">Use toploading balance to mass
approximately 3 more grams of unknown ( read mass to 0.01 g)</font></li>
<li>Quantitatively transfer massed unknown solid to test tube
containing paradichlorobenzene and previously massed unknown.</li>
<li><font face="serif">Do 4 through 8 of part 1 (now with
approximately 6 g of solid included) to collect two sets of
data. </font></li>
</ol>
<font face="serif"><b>Clean-Up</b><br>
<br>
</font><br>
<ol>
<li><font face="serif">Re-melt the solution in the hot water bath
located in the fume hood. Pour the solution in to the
labelled waste container. <br>
</font></li>
<li><font face="serif">A small amount of acetone may be used to
dissolve whatever is left in the test tube.</font></li>
<li><font face="serif">Return checked out components to stockroom
and clean up lab space.<br>
</font></li>
</ol>
<font face="serif"><br>
<br>
Brooke and I will be checking notebooks at the beginning of lab
tomorrow. Please have them open on the benchtops at the beginning
of lab so we can do this quickly. Those who are not prepared will
be asked to leave until they can show that they are ready for lab
with a prepared notebook. Your partners will be very upset with
you if you have to do this...<br>
<br>
<br>
</font>
<pre class="moz-signature" cols="72">--
Andrew J. Pounds, Ph.D. (<a class="moz-txt-link-abbreviated" href="mailto:pounds_aj@mercer.edu">pounds_aj@mercer.edu</a>)
Professor of Chemistry and Computer Science
Mercer University, Macon, GA 31207 (478) 301-5627
<a class="moz-txt-link-freetext" href="http://faculty.mercer.edu/pounds_aj">http://faculty.mercer.edu/pounds_aj</a>
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