Name (please print neatly) Section: I. Recrystallization serves what purpose? (0

Question

Name (please print neatly) Section: I. Recrystallization serves what purpose? (0.5 pt.) 2. When carrying out a recrystallization, a minimal amount of solvent is typically used. a) Explain how the minimal amount of solvent needed for a recrystallization is determined. (1 pt.) b) Why should a minimal amount of solvent be used for a recrystallization? (1 pt.) 3. A student attempts to recrystallize an impure sample of benzoic acid by adding the sample to hot water and boiling off the water to dryness until crystals form. Why is this not a recrystallization? (1 pt.) 4. Why should a melting point apparatus be unplugged when not in use? (0.5 pt) 5. When taking a melting point, why should the temperature rate of increase not be too rapid? (0.5 pt.) 6. In trving to assess the level of danger presented by some of the chemicals used in the organic

Explanation / Answer

Ans. 1.

Recrystalization is the process of obtaining pure form of crystals. Crystals synthesized in lab may contain impurities, therefore, to remove those impurities recrystalization is done. A specific solvent is chosen for recrystalization process so that it can dissolve the impure substance leaving behind the crystals of the desired compound only and that too in its perfect shape and size.

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