Re: xylene question

does anyone on this list know the difference from xylene orto,meta a para xylene? am i the only one that took organic? 
to answer your question in the simplest terms, the fact that you received the meta xylene as opposed to the mixture you are used to ( a combination of all three types of xylene) will in no way harm your processor or tissues. the big difference is the meta is more expensive. the different types of xylene, orto meta and para refer to the position of the 2nd  methyl group that is added to the ring. for example a ortho xylene the 2nd methyl is added to the next position to the first carbon. a meta is 2 carbons and a para is the third carbon. it is easier to explain organic nomenclature with drawings. 
Ortho -xylene is 1,2-dimethylbenzene; it melts at 25 and boils at 144. Meta -xylene is 1,3-dimethylbenzene; it melts at 48 and boils at 139. Para -xylene is 1,4-dimethylbenzene; it melts at 13 and boils at 138.  as you can see the differences are minimal. 
for most uses a mixture of all 3 xylenes is acceptable. 

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