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<p>[QUOTE=&quot;Kentucky, post: 2385016, member: 33176&quot;]Sorry...those short naps are great...&nbsp; We have mentioned polar and non-polar solvents, but within organic solvents, there are aliphatic and aromatic solvents.&nbsp; Each of these is better at dissolving some substances than others.&nbsp; An aromatic solvent has the presence of a benzene ring while an aromatic solvent doesn&#039;t. Benzene is out as a solvent (although as an undergraduate we used it extensively) because it causes cancer.&nbsp; Toluene is good, but many object to the odor and it evaporates fast.&nbsp; Xylene (BTW...Benzol, Toluol and Xylol are the same stuff) evaporates more slowly and therefore has less odor, so it tends to be the solvent many turn to.[/QUOTE]</p><p><br /></p>

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