Extraction of Caffeine from Tea

Question 1

Objective

Answer 1

• extraction of caffeine from instant tea
• crude extraction will then be purified through the use of recrystallization
• find the mass percent of caffeine if instant tea

Question 2

What is the nucleophile and electrophile?

Answer 2

analine

acetic anhydride

Question 3

What is emulsion?

Answer 3

bubble layer

Question 4

What is the filtration washed with?

Answer 4

DCM

Question 5

What is the liquid/liquid extraction and density?

Answer 5

-organic layer-bottom
-aqueous solution- top
DCM is more dense than water

Question 6

What is the drying agent?

Answer 6

Sodium sulfate

Question 7

Recrystallization using 2 solvent solution

Answer 7

derivative compound (caffeine) and original compound

Question 8

melting point

Answer 8

solid to liquid

Question 9

melting point range in pure and impure compounds

Answer 9

• purer the material the narrower the range of temperature

- impure will have a broader range of melting point temperture

Question 10

What is the molar mass of Caffeine?

Answer 10

194.19 g/mol

Question 11

What is the molar mass of Caffeine?

Answer 11

194.19 g/mol

Question 12

Caffeine belongs to the family of naturally occurring compounds called____

Answer 12

xanthines

Question 13

What does the xanthine family stimulate?

Answer 13

CNS and skeletal muscles

Question 14

Which xanthine tends to be the most powerful in this respect?

Answer 14

caffeine