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.

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.

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter80: Crystallization: Purification Of Solids

Section: Chapter Questions

Problem 4P

See similar textbooks

Similar questions

We want to extract terpenoids from an aqueous sample by continuous liquid-liquid extraction. Which of the following solvents is not suitable for this purpose? Why? Propanone (acetone), dichloromethane, heptane.
What are emulsions? Why do they form during extractions? How is their formation minimized?
What is the reason for using as little ethanol as possible to dissolve the crude product before recrystalliazation?
Should you use distilled or deionized water for each of the following processes? a. If you’re making an ice bath, you should use tap faucet water or deionized water are the selections for all parts b. If you are washing your crystals during filtration, you should use [ Select ] ["Tap (faucet)", "Deionized"] water. c. If you add water to your reaction to aid in crystallization, you should use [ Select ] ["Tap (faucet)", "Deionized"] water. d. If you are washing dishes, you should use [ Select ] ["Deionized", "Tap (faucet)"] water...
If 80% of a desired compound is extracted into the organic phase in each step (leaving 20% in the aqueous layer), how many extractions are necessary to ensure that at least 99% of the compound has been recovered in the organic phase? 1 extraction 2 extractions 3 extractions 4 extractions
How to tell if recrystallization successfully purified the sample? Why?
What is the purpose of washing the crude product with petroleum ether before filtration?
Diethylacetal can be detected by gas chromatography. How does this impurity arise in fermentation?
Based on the readings and lecture on emulsions, and the procedures for this lab answer the following question. What is the dispersed phase in the simple vinaigrette? Air Oil Water Egg
What is the reason for using as little ethanol as possible to dissolve the crude product (aspirin) before recrystallization?
Assume there is confusion as to the nature of a liquid that is being distilled off from 1,4 dimethoxybenzene. Describe a simple technique you could use to prove the nature of the substance being distilled off.
Which of the following should be done if there is no recrystallization due to the unsaturation of the solution? (mixed solvent recrystallization) a. Crystal seeding b. Scratching the inner walls or bottom of container c. Further boiling of solvent d. Adding small amount of sample