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- We want to extract terpenoids from an aqueous sample by continuous liquid-liquid extraction. Which of the following solvents is not suitable for this purpose? Why? Propanone (acetone), dichloromethane, heptane.Why is it more difficult to recrystallize benzil when using hexane as a solvent instead of ethanol?Diethylacetal can be detected by gas chromatography. How does this impurity arise in fermentation?
- Why is dilute ethanol used as a slovent for the assay of salicylic acid?Which combination cannot be used as mobile phase in RPLC? A. Acetonitrile-cyclopentane B. Water-acetonitrile C. Acetonitrile-THF D. Water-THFWhy is methanol chosen as the solvent for recrystallization? What would happen if the student uses dichloromethane instead?
- What are the densitites and boiling points of the two liquid components of this distillation? What do you expect to happen to the observed densitites and boiling points of the fractions you collect? Would you expect unfermented wort to have a higher, lower, or same density as the fermented? Why?Calculate the weight of nitrobenzene that codistills (bp 99°C) with each gram of water during a steam distillation. You may need the data given.What would you expect the melting point range of the recrystallized caffeine sample. Why would it have that melting point range?
- n-Pentanol is an aliphatic alcohol with many properties similar to ethanol. Explain why n-pentanol was not considered as a possible recrystallization solvent for fluorene during our laboratory experiment.5. 1. What is the purpose of testing distilled water and laboratory ethanol in the testing of ethanol? 2. During the experiment, you recorded the vapor temperature of the samples. Does the literature B.P. of ethanol correspond to the recorded temperatures? Why or why not? 3. Based on the iodoform test, did your distillate portion contain ethanol and/or water? Explain?In a distribution coefficient experiment; Which of the following organic solvents can be used in this experiment: ethanol, acetone, diethyl ether, methylene chloride, propanoic acid, acetonitrile? Explain your answer