I NEED HELP FAST PLEASE. THIS IS A TIMED HOMEWORK :( A student ran the following
ID: 988716 • Letter: I
Question
I NEED HELP FAST PLEASE. THIS IS A TIMED HOMEWORK :(
A student ran the following reaction and chose to purify the crude product by recrystallization with methanol. Which of the following selections gives the correct steps for this in the correct order?
A) (1) Heat the methanol to boiling (2) Add the methanol dropwise until the crude product is just dissolved (3) Allow the solution to sit undisturbed and slowly cool to room temperature (4) Further cool the solution in an ice bath (5) Separate out the crystals from the mother liquor by filtration (6) Wash the crystals with a minimal amount of ice cold methanol.
B) (1) Slowly add room temperature methanol dropwise until the crude product is just dissolved (2) Allow the solution to sit undisturbed and slowly cool to room temperature (3) Further cool the solution in an ice bath (4) Separate out the crystals from the mother liquor by filtration (5) Wash the crystals with a minimal amount of ice cold methanol.
C) (1) Heat the methanol to boiling (2) Add the methanol dropwise until the crude product is just dissolved (3) Allow the solution to sit undisturbed and slowly cool to room temperature (4) Separate out the crystals from the mother liquor by filtration (5) Wash the crystals with a minimal amount of methanol.
D) (1) Heat the methanol to boiling (2) Add the methanol until it is twice the volume of the crude product (3) Allow the solution to sit undisturbed and slowly cool to room temperature (4) Further cool the solution in an ice bath (5) Separate out the crystals from the mother liquor by filtration (6) Wash the crystals with a minimal amount of ice water.
A) (1) Heat the methanol to boiling (2) Add the methanol dropwise until the crude product is just dissolved (3) Allow the solution to sit undisturbed and slowly cool to room temperature (4) Further cool the solution in an ice bath (5) Separate out the crystals from the mother liquor by filtration (6) Wash the crystals with a minimal amount of ice cold methanol.
B) (1) Slowly add room temperature methanol dropwise until the crude product is just dissolved (2) Allow the solution to sit undisturbed and slowly cool to room temperature (3) Further cool the solution in an ice bath (4) Separate out the crystals from the mother liquor by filtration (5) Wash the crystals with a minimal amount of ice cold methanol.
C) (1) Heat the methanol to boiling (2) Add the methanol dropwise until the crude product is just dissolved (3) Allow the solution to sit undisturbed and slowly cool to room temperature (4) Separate out the crystals from the mother liquor by filtration (5) Wash the crystals with a minimal amount of methanol.
D) (1) Heat the methanol to boiling (2) Add the methanol until it is twice the volume of the crude product (3) Allow the solution to sit undisturbed and slowly cool to room temperature (4) Further cool the solution in an ice bath (5) Separate out the crystals from the mother liquor by filtration (6) Wash the crystals with a minimal amount of ice water.
Explanation / Answer
Answer is (A)
A) (1) Heat the methanol to boiling (2) Add the methanol dropwise until the crude product is just dissolved (3) Allow the solution to sit undisturbed and slowly cool to room temperature (4) Further cool the solution in an ice bath (5) Separate out the crystals from the mother liquor by filtration (6) Wash the crystals with a minimal amount of ice cold methanol.
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