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Separation of Substances
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Chemistry 11: Introduction to Chemical Separation Techniques of MixturesMagnetic Sieves
Magnetic sieves exploit the magnetic properties of certain materials. When a mixture containing
magnetic and non-magnetic components is passed through a magnetic sieve, the magnetic
component is attracted to the sieve while the non-magnetic component passes through.
Example: Separating a mixture of iron filings (magnetic) and sand (non-magnetic) using a
magnetic sieve. The iron filings are attracted to the magnetic sieve, leaving behind the sand.
Distillation
Simple Distillation:
Simple distillation separates substances with different boiling points. The mixture is
heated, and the component with the lower boiling point vaporizes first, while the other
components remain liquid. The vapor is then condensed back into liquid form.
Example: Separating ethanol (boiling point: 78.37°C) from water (boiling point: 100°C) by
heating the mixture. Ethanol vaporizes first, and the vapor is collected and condensed to
obtain pure ethanol.
Fractional Distillation:
Fractional distillation is used when the components of a mixture have closer boiling
points. A fractionating column is added to the distillation setup, providing multiple
condensation and vaporization stages. This allows for more efficient separation of
components with similar boiling points.
Example: Separating different hydrocarbons in crude oil, where the various fractions
(such as gasoline, diesel, and kerosene) have close boiling points.
Solvent Extraction Funnel
Solvent extraction utilizes the differential solubility of substances in different solvents. The mixture
is dissolved in a suitable solvent, and then another solvent is added which selectively dissolves
one component. The two immiscible layers are then separated.
Example: Extracting caffeine from tea leaves by dissolving the mixture in water, adding
dichloromethane (which selectively dissolves caffeine), and then separating the two layers.
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