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Step by step
Solved in 2 steps
- Compare simple and fractional distillation for the separation of HEXANE and TOLUENEDiethyl ether and methylene chloride are generally not suitable for use in recrystallization, but are frequently used as extraction solvents. ExplainWhy is important to allow the saturated solution to cool down slowly during the recrystallization?
- Why should the recrystallization solvent have a fairly low boiling point?Acetone and isopropyl alcohol are generally not suitable for use in extraction, but are frequently used as recrystallization solvents. ExplainHow 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 statement about liquid-liquid extraction is not correct? * A- A solvent must be available that is miscible with the solution containing the substance to be extracted. B- The solvent used for extraction must have a good ability to dissolve the desired substance. C- The denser solution forms the bottom layer in the extraction funnel. D- The extraction funnel must be vented during the extraction procedure to prevent excessive build-up of pressure inside the extraction funnel. E- All these statements are correct.Why is it important to cool slowly during recrystallization6 Assuming that hexane and water obey the required solubility criteria, why could they still not be used as a solvent pair in a mixed solvent recrystallization? Explain.
- 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 is water not a good recrystallization solvent for sodium benzoate? a. Sodium benzoate is soluble in cold water. b. Sodium benzoate is soluble in hot water.Why the Refractive Index of hexane and heptane from simple distillation closer to the refractive index of hexane and heptane from fractional distillation?
