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Cambridge IGCSE chemistry
Lesson 5, Topic 3
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