For the purification by crystallization labWhat properties are necessary and desirable for a

Question

For the purification by crystallization lab

What properties are necessary and desirable for a

solvent in order that it be well suited for re-crystallizing a particular organic compound?

Why is suction firation preferable to ordinary gravity firation for separating the purified crystals from the mother-liquor? Why is it desirable to turn-off the vacuum before washing the crystals with small portions of fresh solvent?

What could be the difficuy in this lab?

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