Posted by Yoo on Tuesday, October 5, 2010 at 1:19am.
How sharp the melting point is and how close to the accepeted melting point the value you find are indicators of how pure the sample might be. Thus a sharp melting point that agrees with the accepted value would indicate a high purity sample.
Even better would be to have a pure sample and the test sample together in the same apparatus, and if these melt at the same time then this is a good indicator that the test sample is pure.
Percentage yield is not a good indcator of purity. I have carried out many a reaction where the yield was low, say 30%, but the product was pure.
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