Why is flameless heating used for heating a solution in hexane or diethyl ether during a recrystallization? Why should the size of crystals obtained in a recrystallization be neither too large nor too small?
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- Why is flameless heating used for heating a solution in hexane or diethyl ether during a recrystallization?
- Why should the size of crystals obtained in a recrystallization be neither too large nor too small?
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- Briefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.What is the problem with using a solvent with a very high boiling point for recrystallization?Recrystallization and Melting Points When performing recrystallization, it is imperative to cool the hot, supersaturated solution slowly. Why?
- Why is important to allow the saturated solution to cool down slowly during the recrystallization?Compare simple and fractional distillation for the separation of HEXANE and TOLUENE- Suppose your sample is mixed with other stuff that is not soluble in your recrystallization solvent. Whenfiltering, should you rinse with hot solvent or cold? Why? - Suppose you've isolated crystals of your sample and are now filtering them. Should you rinse with hotsolvent or cold? Why?
- Why is it important to perform a fractional distillation slowly? What happens if a fractional distillation is done very quickly by rapidly raising the temperature of the heat source?How can the temperature and the vapour pressure in a fractional distillation be effectively controlledIn caffeine recrystallization, explain how recrystallization was performed and how pure caffeine was obtained.
- Briefly explain why crystals form as the solvent cools during recrystallization.Assume that your compound recrystallizes equally well from benzyl alcohol and isopropyl alcohol. Which solvent is the better choice for recrystallization? a. Benzyl alcohol because it is miscible with water. b. Isopropyl alcohol is better because it has a much lower boiling point and is easier evaporate off c. A mixed solvent - benzyl alcohol and isopropyl alcohol d. It doesn't matter which one if they work equally in the recrystallization process.List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillation