experiment 6 - Carlos Caceres 3/30/09 Recrystallization and...

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Carlos Caceres 3/30/09 Recrystallization and Melting Points To decide on a solvent for the recrystallization, each member in the group chose a separate solvent and did several procedures to see whether or not the solvent chosen was good for recystallizing unknown B. Each member was given about .9g of the solute to test with. To choose a good solvent, B had to be insoluble in the solvent at room temperature. When heated, B had to dissolve in the solvent. When tested, reagent grade acetone completely dissolved B at room temperature. 95% ethanol, diethyl ether, hexane, and water were all solvents that could not dissolve B at room temperature. But when heated using a sand bath, B only dissolved in 95% ethanol. The other solvents, no matter at what temperature, never dissolved the unknown. Because of this, the group decided on the ethanol as the solvent of choice. The rest of unknown B was divided evenly between group members to perform a recrystallization. Each member measured the mass of unknown. Using ethanol, the
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This note was uploaded on 09/14/2009 for the course BIO biology taught by Professor Meighan during the Spring '09 term at University of California, Berkeley.

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experiment 6 - Carlos Caceres 3/30/09 Recrystallization and...

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