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Unformatted text preview: approximately 5 ml of cold water. Continue to run the vacuum for several minutes after the
filtration is complete to help dry the collected solid. Transfer the collected solid to an un-capped
sample vial to dry for a week. Alternatively, place the Buchner funnel (with solid and filter
paper) upright in a beaker and store in the lab drawer for a week. When the solid is completely
dry, weigh the solid, and calculate the amount of acetylsalicylic acid recovered. Report the result
as a weight and percent of the total weight of the Phensuprin (percent composition).
Dry the remaining organic solution over anhydrous sodium sulfate. Place a scoopful of the
anhydrous sodium sulfate into the “wet” methylene chloride solution and swirl. Most of the
drying agent will clump together (becomes hydrated). Keep adding sodium sulfate, in small
portions, until some of the drying agent remains free-flowing. Swirl for several minutes, then
decant or filter through fluted filter paper into a clean, dry and pre-weighed 100 mL roundbottom flask. Evaporate the methylene chloride (solvent) using a rotary evaporator until all of
the solvent has been removed. The acetanilide component should be present as a solid. Save the
solid in the unstoppered round bottom flask for the next lab period. After all three solids have dried (next lab period), weigh the solids, and calculate the amount of
each component recovered. Report the result as a weight and percent of the total weight of the
Phensuprin (percent composition). To determine the purity of each component, take the melting
point of each component and compare them with their literature values....
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