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recrystallization (1)

recrystallization (1) - E XPE RI M E N T...

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E XPERIM ENT : R E CRYST A L LIZ A TION Name _______________________________________ Instructor ____________________________________ Chem ____________ Section/Color _____________ Date ________________________________________ Laboratory Questions 5. These questions are to be completed and turned in with the Laboratory Report. POST-L AB QUESTIONS 1. What is the purpose of a hot filtration in a recrystallization? When would a hot filtration step not be necessary in a purification by recrystallization? What experimental observation of the hot solution would let you know that it was not needed? 2. None of the following three compounds has much solubility in water at 25 C. However, two of these are appreciably soluble in hot water. Which of the three compounds can we predict, based upon structure, to be the least soluble even in hot water? Explain your answer. (Hint: Which parts of each molecule of each molecule will form hydrogen bonds with water (see text for hydrogen bonding discussion)? Which structure has the lowest ratio of hydrogen bonding components to fatty carbon/hydrogen components?) OH N HO C H O CH 3 C OH OH O 2-naphthol acetaminophen
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