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Question
Two miscible liquids, A and B, are present in a mixture. The boiling point of A is 60 °C and the boiling point of B is 90 °C. Suggest a method to separate them. Also, draw a labelled diagram of the method suggested.
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Answer
Simple distillation
, because the boiling points differ by 30 °C, which is more than 25 °C.
Explanation
Difference in boiling points
=
90 °C − 60 °C =
30 °C
- On heating, A vaporises first at 60 °C.
- That vapour is cooled in the condenser and collected as pure liquid A in a separate container.
- B is left behind in the distillation flask.
The diagram is the one in Fig. 5.12 — distillation flask holding the mixture, thermometer at the neck, water condenser with the inlet at the bottom and the outlet at the top, receiver conical flask, and wire gauze, tripod stand and burner below.
← Back to: 5.3.2 Distillation
