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Unformatted text preview: stations in the hoods by clamping your vial into a water bath under a Pasteur pipet, through which you can direct a stream of air [see Fig. 3.12, p. 542]. 7.[p.99, para 2]: Skip the Vacuum filtration step; it should not be necessary. When the solvent is gone, scrape the isolated solid* onto a piece of filter paper. Fold the edges carefully around the sample and tape closed. Store in a labeled beaker and place on the sample collection tray. *NOTE: The ibuprofen samples may appear glassy rather than crystalline; either scratch with your microspatula to induce crystallization or place in a beaker of ice. 8. Day TWO : a. Scrape your "dried" sample onto a pre-tared weighing paper and obtain the mass of isolated solid. Use this weight (along with the initial weight of your tablets) to calculated the % recovery of your active ingredient. b. Determine the melting point on the crushed, dried crystals you isolated. c. Place your product in a small vial, labeled with your team members....
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- Spring '09