Lab 4: OCHEM1
Distillation **** the process of separating the component substances from a liquid mixture by selective evaporation and condensation
-usually miscible liquids
Simple distillation ****
Distillation **** the process of separating the component substances from a liquid
mixture by selective evaporation and condensation
-usually miscible liquids
Simple distillation **** used when only one volatile liquid is present in the mixture
Fractional distillation **** used when two or more volatile liquids are present in the
mixture
Gas chromatography **** provides analytical separation and quantification of volatile
liquids in a mixed sample
Why do we wrap aluminum foil around the fractional column? **** To avoid heat loss
What electric source do we use? **** Variac alongside the heating mantle
Remember, that gas chromatography is just another version of **** TLC
GC Mobile Phase **** inert carrier gas, such as Helium
Stationary phase **** imbedded on the inner surface of the column
The compound reaching the detector is recorded at a... **** specific time (retention)
and intensity, which then yields a chromatogram
Chromatograms display the relative... **** concentrations of compounds in a mixture
(area under the curve)
Retention time **** time it takes for the compounds to travel from the injector port to the
detector
Remember that fractional distillation is more.. **** accurate
Efficiency of fractional distillation depends on: **** 1. Surface area of packing material
(steel wool)
2. Length of column; longer the column, the better the separation
-provides a temperature variance between the bottom and the top
3. Boiling point difference between component mixtures
4. Rate of heating.
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