Organic Chemistry 1. Pure compounds have higher (and sharper) melting points than compounds thatcontain impurities. However, after carrying out their procedure in week 3, some studentsfind that their sample(s) after recrystallization have lower melting points than theirsample(s) before recrystallization. Give an explanation for why this might sometimeshappen.

Melting point depends on the intermolecular forces of attraction to a greater extent. Pure crystal…

Answered: 1. Pure compounds have higher (and…

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter4: Recrystallization

Section: Chapter Questions

Problem 1Q

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Compounds with a lower boiling point and higher boiling point will what? A. Rapidly cool down in the fractionating column B. Never evaporate C. Rapidly evaporate in the fractionating column D. Be extracted from the higher parts of the fractionating column
Knowing that Pentane is a good solvent at room temperature for naphthalene, would it also bee a good recrystallizing solvent? Why or why not?
What are emulsions? Why do they form during extractions? How is their formation minimized?
a student performed a recrystallization on 515 mg of impure compound using ethanol. After isolating the crystals, he obtained only 215 mg of pure product. Knowing that his sample was only slightly impure, he concluded that a significant amount of product was lost. Explain what likely happened and what he can do to recover his product.
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?
Steam distillation can be used to extract essential oils from cloves. Which extraction technique would you use to extract terpenes and why?
Give the examples of emulsion prepare by these method:- 1)dry gum method 2)wet gum method 3)bottle gum method
What specific impurities are removed by the ethanol and acetic acid in ethanol washes? Explain
The melting point of p-anisalacetophenone is slightly lower than the boiling point of ethanol, during the recrystallization, if you placed the beaker with the crystals on the hot plate without any ethanol, what would have happened to the crystals?
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?
why would ethanol (solvent) be used in recrystalization?
Meisha mixes 100.0 g of potassium bromide with 100.0 mL of water at 20 degrees Celsius. Is this an unsaturated or saturated mixture? Explain.

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