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Unformatted text preview: EXPERIMENT 2 RECRYSTALLIZATION AND MELTING POINT Name: Dhara Patel Date: February 7, 2008 Objective: To identify the melting point of the purified acetanilide and isolate it from the crude (impure) acetanilide by use of recrystallization. Discussion: Recrystallization is a purification technique that is based on the difference in the solubility of the preferred compound and the impurity (impurities) contaminating the desired compound, as a function of varying temperature. The crude mixture (3.66 grams) is placed in the minimum volume of 60 ml of the water solvent that would dissolve the entire solid at (or near) its boiling point. This mixture is then heated and stirred to reach boiling. The objective at this point is to obtain a saturated solution at boiling. After reaching the boiling point, with the entire solid dissolved, the solution is left to cool slowly. As the temperature is slowly dropped, the compound of interest gradually starts to precipitate out (crystallize), while the impurities stay...
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This lab report was uploaded on 04/19/2008 for the course CHEM 136 taught by Professor Ms.g during the Spring '08 term at Hartford.
- Spring '08