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What kind of crystals would have more surface contamination after cooling the acetanilide in the recrystallization experiment?
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- Part B: Miscibility of liquids 1. Place 10 drops of propan-2-ol into each of two DRY semi-micro test tubes. 2. Add 10 drops of water to one test tube and 10 drops of cyclohexane to the other test tube, shake and observe whether the two liquids in each test tube are miscible. Record your results then discard the contents of the test tubes into the organic waste container. 3. Place 10 drops of water in a clean semi–micro test tube and add 10 drops of cyclohexane to it. Record whether the two liquids are miscible. If two layers form (i.e. the liquids are immiscible) add a drop of blue food dye to the mixture and shake, then allow the two layers to reform. Based on your observation, decide whether the food dye is more soluble in water or cyclohexane and then discard the mixture into the non–halogenated waste container. Record whether the combinations of liquids shown below are miscible. Water Cyclohexane Propan-2-ol CyclohexaneWhat are emulsions? Why do they form during extractions? How is their formation minimized?3. When separating hexanes and heptane (both organic liquids), which would be the most suitable means of separation? a. recrystallization b. steam distillation Your answer: c. fractional distillation d. simple distillation
- what is the role of methanol for extracting chlorophyll? What molecular force holds your chlorophyll and solvent together?Account for the greater amount of internal pressure in the aspirin extraction versus the naphthol extraction ?Match the steps given below for caffeine isolation. A. The mixture is filtered using a Big Buncher funnel after adding Celite. B. The aqueous solution is mixed in a separatory funnel by adding dichloromethane. C. The product is dissolved in toluene on a steam bath. D. Crystals formed in the ice bath are separated and dried. E. In the evaporator, the dichloromethane phase of the caffeine solution is evaporated to dryness. F. A mixture of dry tea leaves, tap water and calcium carbonate is steamed or heated.
- 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.Give the advantages of using steam distillation in the recovery of an organic liquid from a mixture.Which of these is NOT true of a good recrystallization solvent? Which of these is NOT true of a good recrystallization solvent? a) The compound is insoluble in the solvent when it is cold. b) The solvent boiling temperature is at least 40 °C. c) The solvent has many impurities. d) The compound is soluble in the solvent when it is hot.
- Which is the more effective extraction technique, single or multiple extractions? Explain.What is an effective way of preventing irregular ebullition or bumping of the mixture during distillation?Why should you use a minimum amount of water to rinse the conical vial while transferring the purified acetaminophen to the Hirsch funnel?