A student rushed through this experiment. Describe the effect that the following

Question

A student rushed through this experiment. Describe the effect that the following procedural changes would have on percent recovery of acetanilide. Briefly explain the basis of each answer. a) Rather than adding 0.5-mL portions of boiling solvent to the acentanilide, the student added 5-mL portions of boiling solvent. b) The student did not pre-heat the gravity filtration apparatus in Part 3. c) The student forgot to cool 5 mL of solvent in Part 5 and washed the crystals with room-temperature solvent.

Explanation / Answer

a) Because of more dilution the formation of crystal rate is slow. b) Hot gravity filtration is used to separate insoluble impurities from a hot solution. Hot filtrations require fluted filter paper and careful attention to the procedure to keep the apparatus warm. As you are not pre heated apparatus, you will end up with impurities along with desired product. c) Using room temperature solvent some amount of crystals will dissolve with solvent and student will get less yield of product.

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