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Distillation question help ?

14951404138042093932620.jpg hi just wondering whether I have lost any mark on this question.
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I am not sure if I gain full marks on this, is there any safety hazards in my drawing as my still head is badly drawn...



Thanks
(edited 6 years ago)
14951407654521287656373.jpg305.8KB
Reply 1
Avatar for Pigster
Pigster
20
The only thing I can't quite see is whether there is a gap around the thermometer, or whether it looks as though it should be sealed.
Reply 2
Avatar for coconut64
coconut64
OP
16
Original post by Pigster
The only thing I can't quite see is whether there is a gap around the thermometer, or whether it looks as though it should be sealed.


te.png I left a gap I think, I just don't really understand why that matters-> is it because the molecules can escape if there is a gap. However I thought if you have a sealed system, it can cause an explosion due to the pressure building up?

Thanks
Reply 3
Avatar for Atiq629
Atiq629
8
Original post by coconut64
te.png I left a gap I think, I just don't really understand why that matters-> is it because the molecules can escape if there is a gap. However I thought if you have a sealed system, it can cause an explosion due to the pressure building up?

Thanks


Unlike in reflux where the gases are immediately condensed and there is little risk of losing the gas, in distillation you must make sure to include a stopper to prevent loss of gas to the environment as the gases are not immediately condensed.
Reply 4
Avatar for Pigster
Pigster
20
Original post by coconut64
I left a gap I think, I just don't really understand why that matters-> is it because the molecules can escape if there is a gap. However I thought if you have a sealed system, it can cause an explosion due to the pressure building up?


You need any gases produced to go down the Liebig and get condensed.

You'll notice that it isn't sealed at the collection end.
Reply 5
Avatar for coconut64
coconut64
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Original post by Pigster
You need any gases produced to go down the Liebig and get condensed.

You'll notice that it isn't sealed at the collection end.


So I need this ( the brown thing) ? jhgj.gif Thanks
Reply 6
Avatar for Pigster
Pigster
20
Original post by coconut64
So I need this ( the brown thing)?


Essentially, you just need to show that there aren't any gaps.
Reply 7
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coconut64
OP
16
Original post by Pigster
Essentially, you just need to show that there aren't any gaps.


Thanks, so for heating under reflux a sealed system is not required?
Reply 8
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Pigster
20
Original post by coconut64
Thanks, so for heating under reflux a sealed system is not required?


You don't heat under reflux OR distillation in a closed system.

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