Exam (elaborations)
Caffeine Pre and Post Lab Questions & Answers 2024!!
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Caffeine Pre and Post Lab Questions & Answers 2024!!
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Name: Score:11 Multiple choice questions
Definition 1 of 11
CaCl2 is a potent drying agent that can promote the emulsions to break; therefore, it isused after
we get our organic extract as it removes any water that may have gotten inthe extract by
absorbing any water, causing any possible emulsions to break within theextract
How does calcium chloride break emulsions?
3. The crude caffeine isolated from tea often has a green tinge. Why?
Caffeine molecule is more soluble in water than in dichloromethane.
Why is a sealed tube used for the measurement of caffeine melting point?
Term 2 of 11
All student should wear safety goggles, wear properly to cover your skin and wear gloves when
you are handling chemicals.
True
False
Term 3 of 11
2. Discuss the impact on results for high or low caffeine mass percentages:
used waterto extract tea bags but not tea powder
didn't shake well during solvent fractionation.
used tap water instead of ice water in the 250-mL beaker or a 250-mL Erlenmeyer flaskfor
sublimation.
Term 4 of 11
Caffeine molecule is more soluble in water than in dichloromethane.
True
False
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