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recrystallization lab

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CHEM 212
Ariel Fenster

Recrystallization Recrystallization is a useful technique used to purify organic compounds. By selecting the appropriate solvent, techniques of dissolution, hot filtration (to remove impurities), crystallization, filtration and drying are used to obtain the pure sample, leaving most of the 1 impurities in the solvent. Mechanisms This lab does not contain any mechanisms or reactions.1 Data 2 Table 1 Name Formula Molecular Weight Amount (g) Amount (mL) # of moles Phthalic acid C H O 166.1 g/mol 1.0789 n/a 6.50x10 -3 8 6 4 Water H 2 18.02 g/mol 5.00 5.00 0.277 Table 22 Name Formula M.P. (°C) B.P (°C) Density Solubility Safety Phthalic C8H 6 4 230 Decomposes 1.60g/mL 0.625g/100mL -combustible acid at high at 25°C temperatures Water H O 0 100 1g/mL n/a - water 2 intoxication Melting point of impure phthalic acid: 200°C Melting point of recrystallized phthalic acid: 200-204°C Yield (g): 0.57g % yield: ( ) Discussion Results were not bad seeing as the recrystallized phthalic acid is somewhat pure. The melting point of the recrystallized phthalic acid is relatively close to the actual melting point of phthalic 3 acid, which according to literature is around 230°C. However the yield was quite poor, as only a little over half of the original mass was obtained. Source
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