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Durning the synthesis of Aspirin from Methyl salicylate we perfom a recrystallization. How do I relate the % yield of each compound to the efficacy of the recrystallization technique?
The instructions are listed below:
Rinse the crystals several times with small portions (2 mL) of ice-cold water and air dry the crystals on a Buchner funnel by suction until the crystals appear to be free of solvent. Record the weight of the crude solid which probably contains water.
To recrystallize: Dissolve the final product in a minimum amount (no more than 1 mL) of hot ethanol in a 25 mL Erlenmeyer flask. Make sure that the product is completely dissolved while gently and continuously heating on a steam bath.
Pour 5 ml of hot water into the flask, then let the flask cool at room temperature for 10 minutes and cool in an ice bath for an additional 5 minutes. Collect the product by vacuum filtration and rinse out of the flask with a few milliliters of cold water.
Calculate the binding energy per nucleon (in MeV) for P-32 (atomic mass = 31.9739 u). mass H = 1.007825 u and mass n = 1.008665 u.
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You have pure beta-D-glucopyranose of 100 grams nearly, it was dissolved in an ethanol/water combination with the intention to recrystallize the sugar. You get pure beta-D-glucopyranose crystals 60 grams back why this 40% loss was to happen.
How long will it take for 75% of nitrogen dioxide to decompose if the initial concentration of nitrogen dioxide is 1.33M
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A. Liquids have very strong attractive forces holding them together B. Liquids have moderately strong attractive forces holding them together C. Liquids have very weak attractive forces holding them together.
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