Back to Course

Cambridge IGCSE chemistry

0% Complete
0/0 Steps
  1. States of matter
    States of matter
    3 Topics
  2. Changing state
    5 Topics
  3. Diffusion
    4 Topics
  4. Experimental techniques
    Taking measurements
    4 Topics
  5. Separation and purification
    4 Topics
  6. Chromatography
    2 Topics
Cambridge IGCSE chemistry Separation and purification Fractional distillation
In Progress
Lesson 5, Topic 3
In Progress

Fractional distillation

Lesson Progress
0% Complete

 Fractional distillation is used to  separate two or more liquids that are miscible with   one another

  • You put your mixture in a flask and stick a fractionating column on top. Then you heat it.
  • The different liquids will all have different boiling points so they will evaporate at different temperatures
  • The liquid with the lowest boiling point evaporates first. When the temperature on the thermometer matches the boiling point of this liquid it will reach the top of the column
  • When the first liquid has been collected you raise the temperature until the next one reaches the top