explain in detail how is crystallization used as a purification technique in organic chemistry
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The solvent should dissolve the target compound (the solute) well at high temperatures but poorly at low temperatures. Additionally, it should not dissolve impurities or should dissolve them well at both temperatures, allowing them to remain in solution when the Show more…
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Outline the successive steps in the recrystallization of an organic solid from solvent and state the purpose of each operation
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Explain recrystallization.
Recrystallization (or Crystallization) is a technique used to purify solids. This procedure relies on the fact that solubility increases as temperature increases (you can dissolve more sugar in hot water than in cold water). As a hot, saturated solution cools, it becomes supersaturated and the solute precipitates (crystallizes) out. In a recrystallization procedure, an impure (crude) solid is dissolved in a hot solvent. As this solution is cooled, the pure product crystallizes out and the impurities stay dissolved. 4. In this experiment, the filtrate collected in the filter flask is neutralized before it is disposed down the drain. What is added to the filtrate to neutralize it and how is it added ? 5. Why is the melting point of the purified crystals determined ?
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