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What is the problem with using a solvent with a very high boiling point for recrystallization?

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter14: Mixtures And Solutions

Section14.4: Colligative Properties Of Solutions

Problem 50SSC

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Briefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.
2. When performing the recrystallization of an impure solid, why is it advised to use the minimal amount of solvent possible? Group of answer choices To minimize the amount of pure solid lost due to its solubility. To minimize the cost of the recrystallization. To reduce the time needed to filter the pure solid from the solvent after recrystallization. To minimize the amount of hazardous materials used.
In an experiment, is a 100% yield possible in recrystallization? Please explain.
In recrystallization, is it always good to have a high % recovery? Explain. What are the advantages and disadvantages of recrystallization?
Briefly explain why crystals form as the solvent cools during recrystallization.
Why is recrystallization not applicable to samples which contain large amount of impurities?
Why is flameless heating used for heating a solution in hexane or diethyl ether during a recrystallization? Why should the size of crystals obtained in a recrystallization be neither too large nor too small?
Give a fundamental description of the recrystallization process. Explain why it is required and how it can be executed.
During a recrystallization, what are 3 ways to induce crystallization of a sample if it at first it fails to crystallize out of solution?
Which of the following statements is true when considering temperature during a recrystallization? More than one answer may be correct. Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed. It is important that the sample is dissolved in just enough hot solvent. O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.
Draw an outline of the recrystallization process- Assume all types of Impurities(Soluble, Insoluble and colored) are present.
List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillation