Answered: a. What are the qualities of a perfect…

a. What are the qualities of a perfect solvent for recrystallization? b. How much solvent must be used in the recrystallization and why?

Introductory Chemistry: An Active Learning Approach

6th Edition

ISBN:9781305079250

Author:Mark S. Cracolice, Ed Peters

Publisher:Mark S. Cracolice, Ed Peters

Chapter16: Solutions

Section: Chapter Questions

Problem 105E

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a. What are the qualities of a perfect solvent for recrystallization?
b. How much solvent must be used in the recrystallization and why?

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6. In a recrystallization, why is it important to dissolve the solute in boiling solvent instead of cold solvent? a. To melt the solute b. To boil the solute c. To use as small amount of solvent to dissolve the solute as possible d. To chemically decompose the impurities
6. What are the factors affect that decrease the percent yield during a recrystallization?
What is the theory behind recrystallization purifying a solid?
Briefly explain why crystals form as the solvent cools during recrystallization.
5. Assuming your solute has good solubility properties in your recrystallization solvent, what is a common cause of low percent recovery in recrystallization? a. too much recrystallization solvent b. too much solute used compared to amount of solvent
Describe the steps involved in recrystallization.
6. Describe the differences between flocculated and deflocculated suspensions. 7. What is the purpose of a wetting agent in a suspension dosage form?
Which is not required in recrystallization? a. solution is filtered at high temperature b. moderate volatility solvent c. saturated solution d. solvent must dissolve the impurities
4. Why is fractional distillation more "efficient" than simple distillation? During boiling point determination the temperature of the vapors is be E
Explain different ways to induce recrystallization.
6. During the recrystallization procedure, a two-solvent system is used. What is a two-solvent system. Explain why two-solvent systems are used in recrystallization.
Once you choose the appropriate solvent, how much solvent should you add to your sample to dissolve? What do you think could happen if you add too much solvent? What could be a reason for your sample not dissolving in the appropriate solvent?