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Author: Subject: drying tube... odd configuration
GreenD
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[*] posted on 3-4-2013 at 09:38
drying tube... odd configuration


Hey, I've only worked with drying tubes once before and they were simple and straight like this:

http://www.americanlabware.com/images/A86.jpg

Now they seem to be popularly like this:
http://www.chem.cuhk.edu.hk/rbs6_photos/Expt12_photo/DSCN980...

Why? I'm assuming I attach them to the same spot - atop the condensor in a refluxing reaction, but now I have to plug both holes with cotton.




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elementcollector1
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[*] posted on 3-4-2013 at 09:44


I have one that's a full 180 degree turn, with only one ground glass joint.
I think it varies from drying tube to drying tube - all work just as well.




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Hexavalent
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[*] posted on 3-4-2013 at 13:16


Yes, those are common too. Personally, I use a Kjeldahl bulb packed with anhydrous CaCl2 and plugged with ordinary cotton wool for a drying tube, which seems to work adequately.



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GreenD
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[*] posted on 3-4-2013 at 23:24


I don't get it, whats the point of the curvature



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[*] posted on 4-4-2013 at 01:04


In case the cotton plug on the bottom fails partly hydrated CaCl2 will fall into your apparatus. This might be problematic in some cases. Also really high apparatuses are easier to tip over and break.
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