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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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RINGMAN RINGMAN
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10 years ago
Can cyclohexane and toluene be separated if the external pressure is 350mm Hg instead of 760mm Hg?
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#1
10 years ago
As the atmospheric pressure decrease the boiling point of a liquid will decrease
The two liquids may start to boil at a low temperature and they can be separated by fractional distillation

At 760 mm Hg Cyclohexane boils at 81oC and toluene at 110.6oC.When the atmospheric pressure is 350 mm they may vaporize very quickly
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#2
10 years ago
Chemicals typically have a lower boiling point when pressure exerted on them is reduced.  This means that cyclohexane and toluene will boil faster under lower atmospheric pressure.

As for the effects on their separation, since the chemicals can evaporate faster, and cyclohexane has a lower boiling point than toluene, it may be possible to separate them through evaporation, but because their boiling points are so close together, fractional distillation would be better.

Hope this helps.
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