Recrystallization of Sulfanilamide & Fluorene- Post Lab 4

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Observations:
  1. The fluorene completely dissolve the toluene almost instantly.
  2. String like crystals appears on the solution when it was cooling.
  3. The pure sulfanilamide appears yellow when wet however, after it was dry returns to a white color
Data:
Weight of Impure Sulfanilamide: 0.80 grams
Weight of Flask: 57.02 grams
Weight of Flask + Pure Sulfanilamide: 57.82 grams
Weight of Pure Sulfanilamide: 0.70 grams
Pure Sulfanilamide: 155-160 degrees Celsius
Percent Recovery: 0.70/0.80 x 100%= 87.6%

Weight of Impure Fluorene: 0.78 grams
Weight of Flask: 30.15 grams
Weight of Flask + Pure Fluorene: 30.96 grams
Weight of Pure Fluorene: 0.57 grams
Melting Point: pure Fluorene: 114-118 degrees Celsius
Percent Recovery: .57/.88 x 100%= 73%
Post-lab Question: 
Which solvent did you determine was best for the recrystallization of fluorene?
Methyl alcohol, water and toluene were the three solvents tested.  Methyl was the best for recrystallization. Fluorene completely dissolve in toluene because both fluorene and toluene are nonpolar. Since the fluorene completely dissolve in toluene this means that it would not allow crystals to form. Water is very polar whereas fluorene is nonpolar this means that fluorene would be insoluble in water. Methyl alcohol was the best choice for recrystallization of fluorene because methyl alcohol is intermediate polarity. The nonpolar hydrocarbon of the methyl alcohol interacts with the nonpolar fluorene. At high temperature methyl alcohol is more soluble than at lower temperature. The fluorene will dissolve at high temperatures and then form crystals at low temperatures.

Comments

  1. AnonymousMay 24, 2022 at 4:45 AM

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