Melting point range Recrystallized Phenacetin 95-100 Recrystallized Phenacetin + Reference Phenacetin 110-115 Recrystallized Benzil 92-95 Recrystallized Benzil + Reference Benzil 94-98 Questions: 1. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of mixed melting point. 2. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of melting point. 3. What are two characteristics of a good recrystallization solvent for a given compound? 4. Given a solid sample that contains impurities, how would you determine which solvent to use for a recrystallization? Describe how you would do this in the laboratory. 5. Clearly explain the difference between a recrystallization and a precipitation.
Melting point range
Recrystallized Phenacetin
95-100
Recrystallized Phenacetin + Reference Phenacetin
110-115
Recrystallized Benzil
92-95
Recrystallized Benzil + Reference Benzil
94-98
Questions:
1. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of mixed melting point.
2. What does your melting point say about the purity of your phenacetin sample? Justify your answer using the characteristics of melting point.
3. What are two characteristics of a good recrystallization solvent for a given compound?
4. Given a solid sample that contains impurities, how would you determine which solvent to use for a recrystallization? Describe how you would do this in the laboratory.
5. Clearly explain the difference between a recrystallization and a precipitation.
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