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- What is the main drawback of using steam distillation in the isolation of volatile oils from its matrix?
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- Contrast the physical appearance of the crude material before the recrystallization and that of the material isolated after recrystallization.1. Why is the washing of crystals on the filter paper not as effective a process of purification as crystallization?2. How do you account for the formation of crystals of different sizes in slow and rapid crystallization process?3. What properties should ideally be possessed by a recrystallization solvent?Why should the recrystallization mixture be cooled in an ice bath prior to filtering?
- Why is the final product from the crystallization process isolated by vacuum filtration and not by gravity filtration?Some procedures include the addition of sodium carbonate before liquid-liquid extraction. What is the purpose of this step?BRIEFLY explain why steam distillation can be used to purify or isolate temperature-sensitive materials.
- Compare simple and fractional distillation for the separation of HEXANE and TOLUENEAcetone and isopropyl alcohol are generally not suitable for use in extraction, but are frequently used as recrystallization solvents. ExplainYou are carrying out an experiment by analysing alcoholic drinks by gas chromatography. Why is Gas chromatography the best technique used for this analysis? Why is Carbowax a suitable stationary phase for this analysis? What gases are used and what is their purpose and source?
- In recrystallization, fluted filter paper is used instead of a regular cone because it minimizes its contact with the glass funnel. Why is this important?Why should the recrystallization solvent have a fairly low boiling point?Why was gravity filtration used instead of evaporation to isolate the calcium carbonate?