1.4 Fractional Distillation And Paper Chromatography
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Chromatography def
The process whereby small amounts of dissolved substances are separated by running a solvent along a material such as absorbent paper
Def biofuel
Fuel made from animal or plant products
Miscible def
Liquids that dissolve into each other
What is a fractionating column?
A tall glass column filled with glass beads
Does the temperature get higher or lower as it goes up the fractionating column?
It goes down
What must the vapours do before reaching the condenser?
The vapours must pass over and between the glass beads in the fractionating column
Why does chromatography work?
It works because some compounds in a mixture will dissolve better than others in the solvent chosen (usually water)
How does chromatography work?
• A capillary tube is used to dab a spot of the solution on a pencil line near the bottom of the sheet of absorbent chromatography paper • The paper is then placed standing in a solvent at the bottom of a beaker • The solvent is allowed to soak up the paper, running through the spot of the mixture
What determines how far the mixtures travel up the paper?
The relative solubility of the components making up the mixture