CHEM LAB FINAL
EXAM 2025
workup of your reaction?
NaHCO3 is used to remove HBr to neutralize the reaction
NaHCO3 is used to enhance the
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NaHCO3 is added to increase the reaction temperature.NaHCO3 is required to precipitate the product from the solution.
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Chromatography What is the molecular basis of separation of organic compounds in thin layer chromatography?
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Chromatography relies on the boiling point of compounds for separation.Chromatography separates compounds based on their molecular weight.
Chromatography is based on the color of the compounds being separated.
Chromatography shows polarity of a solvent.
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separation by solvent extraction labWhy do we dissolve the given mixture in diethyl ether and not water?
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Water is a better solvent for all organic compounds.Organic compounds are typically insoluble in water, but are soluble in diethyl ether since it is a less polar organic solvent.
Diethyl ether is a solid at room temperature.Since caffeine is very soluble in hot water, it extracts most of the caffeine.
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Carboxylic acid location on +NMR
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near 16 ppm about 12 ppm 3 / 4
around 8 ppm approximately 14 ppm
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Alcohol location on +NMR
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approximately 6-7 ppm about 2-5 ppm
around 1-2 ppm near 9-10 ppm
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recrystalization labWhy do you add activated charcoal in recrystallizing solution? Boiling chips?
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