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How to prepare primary emulsion by Forbes method and why this method is called Extemporaneous?
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- Why is distillation of cyclohexanol using acid catalyst phosphoric acid a better technique to purofy rather than extraction, recrystallization, chromatography, IR spectroscopy?In a liquid – liquid extraction, what is preferable? Three extractions with a small volume or one extraction with a large volume. Explain briefly.Which of these could not be used in an extraction with water? Explain why you chose these solutions:Acetone, Diethylether, dichloromethane, ethyl aceate, chloroform, ethanol, and hexane
- i need help determining amount recovered in an extraction. i started with a .51g mix of naphlathene/benzoic acid. then, i ended up with the organic in the flask weighing 56g, with the initial weight of the flask without product being 46g. how do i determine amount recovered AND the % recovery?(extraction, reactive extraction, recrystallization). Write a few sentences for each technique explaining themWhich is the more effective extraction technique, single or multiple extractions? Explain.
- What roles do solvent, density and polarity play in liquid/liquid extractionThree sample, X (neutral), Y (basic), and Z (acidic), were mixed and dissolved together in dichloromethane. Propose a method to separate all given sample individually using the combination of liquid-liquid extraction, crystallization, distillation, and sublimation technique.Imagine that the blue component of a given mixture moved 2.5 cm from the oigin or starting line, and the solvent had traveled 10.0cm, What is the Rf for the blue dye A .4.4 B 0.25 C. 7.5 D. 25
- After extracting NaOH two times from ether, does the amount of precipitate after adding HCl in both tubes indicate that all acid impurity has been removed from the ether layer containing the neutral compound? There was a lot of precipitate in the first extraction and almost nothing in the second extraction after adding HCl to both.A thin-layer chromatography (TLC) experiement was run using three compunds: benzophenone, benzhydrol, and biphenyl. The three solvents that were used with the three compounds were hexane, ethyl acetate, and dichloromethane. Which solvent would be the best for separating these compounds and why?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, IV