Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781305577190
Author: Kenneth L. Williamson, Katherine M. Masters
Publisher: Brooks Cole
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Question
Chapter 6, Problem 5Q
Interpretation Introduction
Interpretation:
The effect of turning off the steam valve before the screw clamp on the adapter trap is opened should be explained.
Concept introduction:
Steam distillation is employed to extract and purify the temperature-sensitive compounds. Steam distillation is generally used for organic compounds sensitive to temperature. The advantage of steam distillation technique is that the temperature-sensitive compounds can be boiled and extracted at lower temperature without decomposition.
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True or False. It is very important to regulate the temperature of the heating mantle so that the distillation occurs at a rate of about 1 drop per 2 seconds.
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True or False. It is very important to regulate the temperature of the heating mantle so that the distillation occurs at a rate of about 1 drop per 2 seconds. Why?
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Chapter 6 Solutions
Macroscale and Microscale Organic Experiments
Ch. 6 - Assign the peaks in the 1H NMR spectrum of eugenol...Ch. 6 - A mixture of ethyl iodide (C2H5I,bp72.3C) and...Ch. 6 - Prob. 3QCh. 6 - Prob. 4QCh. 6 - Prob. 5QCh. 6 - A mixture of toluene (bp110.8C) and water is steam...Ch. 6 - Did sublimation aid in the purification of the...Ch. 6 - Prob. 8QCh. 6 - Prob. 9QCh. 6 - Prob. 10Q
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- 3. A pure white crystalline compound was found to melt at 131.5-132.0°C when taken on a melting point apparatus, and on further heating, the liquid was found to start bubbling at ca. 155-160 °C. The capillary containing the melted compound was set aside to cool, and resolidify. When the sample was retried using that same capillary, the sample melted at 120.6-154.5°C, along with some bubbling. What is the cause of the bubbles? Why is the melting point so wide the second time? Explain by stating what you have learned in this laboratory about melting points.arrow_forwardwhat is the purpose of steam distillation? and what are the factors involved ?arrow_forwardWhen isolating the solid after recrystallization using vacuum filtration what solvent should you use to aid in the rinse from the Erlenmeyer flask to the vacuum filter funnel? (Only pick one answer) Group of answer choices: Cold ethyl acetate Cold ethanol Hot ethyl acetate Hot ethanol Hot water Cold water None of the above, it should not be risnedarrow_forward
- Which is the most appropriate way to dispense liquid using a dropper (vertical, 45° angle, or horizontal? Justify your answerarrow_forwardEWhat are the advantages of using steam distillation in the recovery of organic liquid from a micture?arrow_forwardSublimation is preferred for small scale purification as compared to crystallization because there is little loss of material during transfer True, sublimation guarantees a 100% yield False, the crystallization process is better because it yields a much purer product especially in small scale purification processes True, sublimation has less loss of material because the process has no intermediate liquid stage False, sublimation is better for large scale purification processes.arrow_forward
- TRUE OR FALSE, if false then give the correct word to make the statement true then explain 1. Sublimation occurs when a solid has a relatively high vapor pressure at a temperature [above] its melting point. 2. To isolate the desired chemical, a single extraction is [more efficient] than extracting the compound numerous times. 3. The compounds are separated in liquid-liquid extraction based on their relative solubilities in two [immiscible] liquids.arrow_forwardIn recrystallization, fluted filter paper is used instead of a regular cone because it minimizes its contact with the glass funnel. Why is this important?arrow_forwardDescribe the procedure of how to collect and dry your newly recrystallized compound.arrow_forward
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