What is the purpose of recrystallization? To purify a compound by recrystallizat

Question

What is the purpose of recrystallization? To purify a compound by recrystallization, one must choose a solvent which will dissolve the compound of interest when _, but which will not dissolve the compound appreciably when _. What will happen if the recrystallization mixture is cooled very quickly so that crystals form very rapidly? In this experiment you will recrystallize acetanilide. Give a fact or two about this compound. A liter of water at 95 degree C will dissolve 85 grams of Compound X.' At room temperature (~25 degree C). a liter of water will dissolve only 2 grams of Compound X. If 38 grams of Compound X is added to a liter of water at 95 degree C, will it all dissolve? _ If 38 grams of Compound X is added to a liter of water at room temperature, will it all dissolve? _ If not. how much will remain undissolved? _ If 38 grams of Compound X is dissolved in a liter of water at 95 degree C and then cooled to room temperature, how much will remain dissolved in the water? _ How much will come out of solution during the cooling process? _

Explanation / Answer

1. Purpose of recrystallization:-Recrystallization/fractional crystallization is a process involving dissolving an impure compound in a solvent at high temperature to create a concentrated solution and then cooling it slowly.

The cooling decreases solubility of both the compound and impurities. The compound crystallizes leaving behind the impurities .The pure crystals are filtered out.For the recrystallization process to be successful there must be only small impurities in the chemical compound and they must be soluble.

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