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3What i the advantage and disadvantage of the low boiling point of acctone when

ID: 1080111 • Letter: 3

Question

3What i the advantage and disadvantage of the low boiling point of acctone when it is used as a recrystallization solvent? 4) What can one What is the drawback of this method? do to obtain a second crop of crystals after initial crystals have been collected? 5) You are given a unknown white solid to recrystallize in lab. The white solid could be Compound A (melting point 74-76°C), Compound B (melting point 91-93°C) or Compound C (melting point 85-86°C). Compound A, B and C are significantly soluble in ethanol (bp: 78°C), even at room temperature and not very soluble in 2-butanone (bp: 80°C). Ethanol and 2-butanone are miscible. as the solvent pair for the unknown white solid, a) If you decide to use ethanol and 2-butanone describe which solvent you would heat up and dissolve the solid in initially and which solvent you would add second and at what point would you stop adding the second solvent. b) If you could use ethanol as the single recrystallization solvent for the solid, which compound might have a problem of oiling out and why?

Explanation / Answer

3What i the advantage and disadvantage of the low boiling point of acctone when

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