Chem 243a - Recrystallization

Chem 243a - Recrystallization - 4A Recrystallization...

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4A: Recrystallization Antonio Alarcon Chem 243a 9/23/07 I. Abstract
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II. Introduction In this lab, two recrystallizations were performed in which crude naphthalene and benzophenone were “purified.” This process involves two main processes (dissolving and filtration); both of which rely upon the different solubilites of a solute in a solvent (the crystallization process is noted by the least soluble solute). Thus, the crystallization process aids in purification by selecting the correct molecules which fit into the crystal lattice and ignoring the wrong molecules (Padias, 33). Up until this point, polarity has been largely oversimplified and reduced to the common knowledge that “like dissolves like.” Although this is correct, much more interaction is occurring on the molecular level. Overall, polarity determines physical properties such as melting point, boiling point, solubility, as well as intermolecular forces (generally polar molecules have much higher melting points/ boiling points than non-polar molecules). This is highlighted within the following: naphthalene, a non-
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This note was uploaded on 04/03/2008 for the course CHEM 243A taught by Professor Bharadwaj during the Fall '08 term at Arizona.

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Chem 243a - Recrystallization - 4A Recrystallization...

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