C2.11 Miscible and immiscible

C2.11 Miscible and immiscible

1. Miscible liquids mix completely. But immiscible don't

2. Separating miscible liquids. they can be separated using fractional distillation

   • The mixture is heated and the vapours pass into a fractioning column
     • The ones with the highest boiling points condense first
       • The different liquids are collected at different parts of the column

3. Distillation of liquid air

   • Nitrogen and oxygen are obtained from air by fractional distillation.
   • -185C is below the boiling point of oxygen but above the boiling point of nitrogen
     • So nitrogen is collected as a gas and oxygen is collected as a liquid.
   • The air goes through a cooling unit at -200C to make liquid air