step 3 of this protocol describes using a minimal amount of boiling solvent to dissolve your impure solid. why is it important to use only a minimal amount of solvent?

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13-09-2022
Chemistry

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step 3 of this protocol describes using a minimal amount of boiling solvent to dissolve your impure solid. why is it important to use only a minimal amount of solvent?

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Tutorconsortium262 Tutorconsortium262 · Answer 1 · 2022-09-16T01:51:08-04:00

Using a minimum amount of solvent is important because it minimizes the amount of material lost by retention.

Why must only a small amount of the required solvent be used for recrystallization?

In order to support the objective of recovering the greatest possible amount of crystals, the amount of solvent used during crystallization is typically kept to a minimum.

Since heat can push some solids over the edge and completely dissolve them, crystallization occurs most frequently in solids with moderate solubility at low temperatures. Accordingly, in practice, a certain amount of the compound will dissolve in the mother liquor at low temperatures. Depending on the solubility profile of the compound, this amount may be significant. Utilizing the least amount of hot solvent possible reduces the amount of compound lost to the mother liquor.

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