0.67 g of ground nutmeg was weighed into a clean, dry round-bottom flask 10 ml o
ID: 1067986 • Letter: 0
Question
0.67 g of ground nutmeg was weighed into a clean, dry round-bottom flask 10 ml of dichloromethane was added. A water-jacketed condenser was attached to the flask, and the mixture was heated to a gentle reflux for 45 min. The mixture was then cooled to room temperature and gravity filtration was performed. After removal of dichloromethane, 0.29 g of crude trimyristin was obtained. It was then recrystallized from hot 95% ethanol yielding 0.34 mmol of pure trimyristin (MW = 723.16 g/mol) with a melting point of 54-56 degree c. The purpose of re fluxing is to a recrystallize trimyristin from nutmeg saponify trimyristin extract trimyristin from nutmeg saponify nutmeg The dissolved trimyristin is best separated from dichloromethane by recrystallization vacuum filtration acid-base extraction rotary evaporation If you did not observe any crystals of trimyristin after the recrystallization process, which of the following steps is least likely to aid crystal formation? dropwise addition of hot solvent (95% ethanol) scratching the inner wall of the container with a glass rod addition of solid trimyristin as a "seed" crystal putting the solution back on the rotovap Based on the quantity of crude trimyristin, what was the percent recovery of pure trimyristin from the recrystallization process? 85% 37% 78% 47%Explanation / Answer
Isolation of trimyristin
7. the purpose of refluxing is to,
c. extract trimyristin from nutmeg
8. The dissolved trimyristing is best separated from dichlormethane by,
b. vacuum filtration
9. If crystals of trimyristin was not seen after refluxing, the following step is least likely to help,
a. dropwise addition of hot ethanol
10. based on crude trimyristin, the percent recovery of pure trimyristin was,
a. 85%
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