2024-10-07T18:05:04+03:00[Europe/Moscow] en true <p>Extraction</p>, <p>Extraction </p>, <p>Solid-liquid extraction</p>, <p>Evaporation or Distillation </p>, <p>Liquid-liquid extraction </p>, <p>dicholormethane, chloroform, ether, ethyl acetate, or hexane </p>, <p>according to their solubilities</p>, <p>one-third </p>, <p>anhydrous calcium carbonate </p>, <p>40, 2</p>, <p>organic layer, aqueous layer, emulsions </p>, <p>anhydrous sodium sulfate </p>, <p>Dark brown</p>, <p>Brown </p>, <p>Dark brown </p>, <p>Brown with greenish residue </p>, <p>Calcium carbonate</p>, <p>Dichloromethane</p>, <p>Venting </p> flashcards
Chem lab 3

Chem lab 3

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  • 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