Posted by Lisa on Sunday, October 17, 2010 at 6:22pm.
I would think your compound is compound A. Compound A with a small amount of impurity will cause it to have a lower melting point in the range of your m.p. AND to be less sharp. I wouldn't think it would be compound B because the melting point of your unknown is ABOVE mp of compound B and your unknown as range not nearly as sharp as A or B. Impurities cause mp to be lower, not higher.
The compound is most likely to be A.This is because Sample A containing little impurities will cause a reduction in its melting point not an increase as it would apply for Sample B.
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