Extraction
is a technique used for separating a compound from a mixture.
Extraction
It is often used to separate a compound from the other material present in a natural product.
Solid-liquid extraction
the desired substance which is initially present in the sample is treated with an appopriate solvent of low-boiling point, the desired substance has the same polarity with the solvent.
Evaporation or Distillation
Solid liquid extraction separation technique of the substance from the solvent
Liquid-liquid extraction
involves the distribution of a compound, called solute, between two immiscible, or non soluble, liquid solvents.
dicholormethane, chloroform, ether, ethyl acetate, or hexane
less polar organic solvent
according to their solubilities
how does various solutes distribute themselves
one-third
the volume of the solvent to the aqueous phase
anhydrous calcium carbonate
added to the water and tea solution before heating
40, 2
Boiling point of Dichloromethane and solubility in water
organic layer, aqueous layer, emulsions
layers in the funnel
anhydrous sodium sulfate
added to absorb water in the organic layer, and break the emulsions
Dark brown
color of the first supernatant liquid
Brown
color of the second supernatant liquid
Dark brown
Color of the filtrate
Brown with greenish residue
Color of the crude caffeine
Calcium carbonate
base for the extraction of caffeine from the tea
Dichloromethane
neutralizes the tannins
Venting
used to make sure the caffeine content would be absorbed by the DCM