Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781305577190
Author: Kenneth L. Williamson, Katherine M. Masters
Publisher: Brooks Cole
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Chapter 4, Problem 3Q
Interpretation Introduction
Interpretation:
The circumstances required for the use of activated carbon during recrystallization should be determined.
Concept introduction:
Recrystallization is a technique that is used to purify the impure compounds. It is based on the principle that the solubility of substances increases with the increase in temperature.
Following are some of the types of recrystallization:
- Single-solvent recrystallization
- Multi-solvent recrystallization
- Hot filtration-recrystallization
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Describe the steps involved in recrystallization.
Why is recrystallization not applicable to samples which contain large amount of impurities?
Briefly explain why crystals form as the solvent cools during recrystallization.
Chapter 4 Solutions
Macroscale and Microscale Organic Experiments
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- 6. What are the factors affect that decrease the percent yield during a recrystallization?arrow_forwardGive a fundamental description of the recrystallization process. Explain why it is required and how it can be executed.arrow_forwardDraw an outline of the recrystallization process- Assume all types of Impurities(Soluble, Insoluble and colored) are present.arrow_forward
- 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.arrow_forwardBriefly explain how slow cooling contributes to the formation of pure crystals during recrystallization.arrow_forwardYou are attempting to purify a compound via recrystallization. You prepare the process through the following method: 1) Dissolve the material in a minimal amount of hot EtOH. 2) Slowly add hot water until the compound is slightly cloudy. 3) Add a small amount of EtOH until the solution is just clear (still hot). 4) Cool to RT. Upon cooling to RT you notice that the compound is not precipitating out of solution. You decide to boil off some ethanol. Upon completing this step and cooling to RT you notice that the compound is precipitating out as desired! In which solvent is your compound the least soluble? Ethanol O Water O The ethanol water mixture Insoluble in all of these solventsarrow_forward
- 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.arrow_forwardWhat are the differences between a simple distillation and steam distillation?arrow_forwardExplain the principle behind vacuum distillation.arrow_forward
- 5. In preparation for the analyses of other types of samples that may reach your laboratory, the supervisor tasked you to research different extraction procedures for the analyses of Tetrahydrocannabinol (THC) and other related compounds so that you can purchase different extraction instruments. How will you convince him to buy a Supercritical Fluid Extraction Instrument? Carrow_forwardIn an experiment, is a 100% yield possible in recrystallization? Please explain.arrow_forwardUsing recrystallization techniques, a student attempts to purify 0.50 g of compound H. Based on the solubility of H in the chosen solvent at collection temperature, the maximum percent recovery is 82%. The student obtains 0.396 g of purified crystals. What is their percent recovery? Group of answer choices 41% 64% 79% 82% 97% none of thesearrow_forward
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