CHEM LAB FINAL EXAM 2025

CHEM LAB FINAL
EXAM 2025




workup of your reaction?




NaHCO3 is used to remove
NaHCO3 is used to enhance the
HBr to neutralize the reaction

, NaHCO3 is added to increase the NaHCO3 is required to precipitate
reaction temperature. the product from the solution.


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2 of 90

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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 Chromatography separates
boiling point of compounds for compounds based on their
separation. molecular weight.




Chromatography is based on the
Chromatography shows
color of the compounds being
polarity of a solvent.
separated.


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, 3 of 90

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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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Organic compounds are
typically insoluble in water,
Water is a better solvent for all
but are soluble in diethyl
organic compounds.
ether since it is a less polar
organic solvent.




Since caffeine is very soluble in hot
Diethyl ether is a solid at room
water, it extracts most of the
temperature.
caffeine.


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4 of 90

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Carboxylic acid location on +NMR



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near 16 ppm about 12 ppm

, around 8 ppm approximately 14 ppm


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5 of 90

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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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6 of 90

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recrystalization labWhy do you add activated charcoal in
recrystallizing solution? Boiling chips?



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