Experiment 10 Caffeine and Oil extraction quiz chem 420

method of extraction used to extract crude caffeine

liquid liquid extraction

describe liquid liquid extraction

mixing two liquids and separating layers

what chemical was added to hot tea before extraction?

Na2CO3

what was the drying agent used for the caffeine extraction?

Na2SO4

for a liquid liquid extraction the two liquids used must not be _____

miscible

miscible

to mix together

the desired compound must be more ____ in the other solvent

soluble

to get the distribution coefficient, how would you calculate it for the caffeine experiment?

concentration of caffeine in organic layer divided by concentration of caffeine in aqueous layer

if given the mg of caffeine in the aqueous layer after extraction, how do you get the mg of caffeine in the organic layer after extraction?

subtract the given from the total

whatever is being subtracted from the total mg of caffeine is also the amount of caffeine that…

remained in the water

the more liquid liquid extractions done, the less…

solute left in water

emulsion

suspension of two liquids inside each other

how are emulsions broken?

physically with bar or centrifuging or adding NaCl

drying agents do what?

remove water

how is the CH2Cl2 removed?

evaporate in warm bath

sublimation point

point where vapor pressure of a solid is equal to atmospheric/applied pressure

name of cold thing used for sublimation? what we filled with ice cold water

cold finger

what was usesd to dissolve the caffeine for the sublimation?

CH2Cl2

to extract the essential oil, what was used to do the liquid liquid extraction?

methylene chloride

what was used to dry the oil?

Na2SO4

what is the name of the pipette used for the caffeine extraction?

pasteur pipette

name of molecule that is in organic matter like wood or leaves

tannins/polyphenols

polyphenols are ____ in taste

bitter

polyphenols are _____ in color

bright