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Distillation question help ? Watch

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    Name:  14951404138042093932620.jpg
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Size:  244.9 KB hi just wondering whether I have lost any mark on this question. Attachment 648798648800 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...



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    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.
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    (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.
    Name:  te.png
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Size:  3.2 KB 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?

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    (Original post by coconut64)
    Name:  te.png
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Size:  3.2 KB 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?

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    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.
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    (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.
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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) ? Name:  jhgj.gif
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    (Original post by coconut64)
    So I need this ( the brown thing)?
    Essentially, you just need to show that there aren't any gaps.
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    (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?
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    (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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