Melting Point for Known Compounds
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* Unknown compound that shows an observed melting range of 90-94 Ë?C. Which is to be, X (listed mp 97-98 Ë?C) or candidate Y (listed mp 86-87 Ë?C). Why might your sample not have the same melting range as either of the known compounds, given that it must be one of them?
* Test tubes labeled A, B, and C contain substances with the same melting points. How could you prove (using the melting point technique) the test tubes contained three different chemical compounds?
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Solution Summary
The solution determines why might the sample not have the same melting range as either known compounds. As well as how to prove test tubes contained three different chemical compounds.
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* Unknown compound that shows an observed melting range of 90-94 Ë?C. Which is to be, X (listed mp 97-98 Ë?C) or candidate Y (listed mp 86-87 Ë?C).
The unknown compound with a melting range of 90-94 must be compound X not compound Y. The reason for this is that a pure compound will always have a higher melting point (and narrower melting range) that the same compound with impurities. The unknown compound is consistent with X since it has both a lower melting point* and wider ...
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