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- 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?1. How does steam facilitate the distillation of essential oils? 2. Discuss some applications of simple distillation and steam distillation. Explain why you can use each method for the chosen application Please explain and do not copy from googleCompare simple and fractional distillation for the separation of HEXANE and TOLUENE
- What is the main drawback of using steam distillation in the isolation of volatile oils from its matrix?Compare the simple distillation of pure hexane and binary mixture of hexane and toluene to that of a fractional distillation?How are solvents chosen for recrystallization? (single solvent or mixed-solvent system).What are the properties of a good solvent system? How are crystals collected?
- Why should the recrystallization mixture be cooled in an ice bath prior to filtering?How does the volume of a solvent affect the purity of the material in recrystallization?With respect to the lower condenser used in an apparatus for simple or fractional distillation. Why should the lower rather than the upper nipple be used for the water inlet?
- How can you tell that a compound is impure? (or pure?) What are the characteristics considered when taking a melting point? What is recrystallization? What is happening on a molecular level (videos are provided) How are solvents chosen for recrystallization? (single solvent or mixed-solvent system).What are the properties of a good solvent system? How are crystals collected?Which of the following could DECREASE the amount of the recovered crystals in the purification by recrystallization experiment? Collecting the recrystallized benzoic acid by filtration using a pre-weighed filter paper. Using a long-stemmed funnel in the hot filtration step. Cooling the filtered solution rapidly. Washing the recovered crystals using hot solvent. a. II, III b. II, IV c. II, III, IV d. I, II, III, IVWhy the Refractive Index of hexane and heptane from simple distillation closer to the refractive index of hexane and heptane from fractional distillation?