Jassica Hamilton
Chem 3512
Professor Leonid Metlitsky
Date: (6/8/20-6/14/20)
Recrystallization of Sulfanilamide and Fluorene
Purpose: The purpose of this experiment is developing an understanding of the crystallization
technique, in which is the most common procedure used to purify crude solids. This technique
involves dissolving the given material to be crystallized in a hot solvent and cooling the solution
slowly, therefore as it cools the dissolved material has a low solubility at lower temperatures.
When performing crystallization, a problem encountered is selecting a solvent, in which being
able to do so will be learned.
Reagent Table:
Reagent
Quant.
Impure Sulfanilamide
0.75 g
96 % Ethyl Alcohol
MW
Density
Moles
172.2
g/mol
1.08 g/cm^3
4.4 x 10^-3 Can cause skin and
eye irritation.
15 mL
46.07
g/mol
798 kg/m^3
3.3 x 10^-1 Can cause skin and
eye irritation.
Methyl Alcohol
15 mL
34.04
g/mol
792 kg/cm^3
3.7 x 10^-1 It is toxic and
flammable.
Toluene
15 mL
92.14
g/mol
867 kg/m^3
1.1 x 10^-2 Can cause skin and
eye irritation. It is
flammable.
Impure Fluorene
0.75 g
166.2
g/mol
1.2 g/cm^3
4.5 x 10^-3 Can cause skin and
eye irritation.
Calculation: How much of the 96% ethyl alcohol is required to dissolve 0.75g of
sulfanilamide at 78 degrees Celsius?
(210 mg) / (1mL) = (750 mg) / (x mL)
X = 3.6 mL of Ethyl Alcohol
Hazards
Flowchart of the Procedure: