Simple distillation is used to seperate a liquid from a solution.
1)The solution should be heated. The part of the solution with the lowest boiling point should evaporate first.
2)The vapour then cools and condenses and is collected.
3)The rest of the solution is left behind.
Fact:You can use simple distillation to get pure water from sea water as the water evaporates and is condensed and eventually the only thing left in the flask is the salt.
Disadvantage: You can only use it seperate things with very contrasting different boiling points, if the boiling poins are too similar the substances will mix together again which is bad. This can be solved by using fractional distillation
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