(Chief Bee)
05-30-03 04:53
No 436452
      Emptying Separation funnels with a stuck stopper
(Rated as: good read)

Reference: Aldrichimica Acta 23(4), 86 (1990)
05-30-03 08:04
No 436486
      Great Tip!!!!  Bookmark   

Good tip!!! I never would have thought of that... I wish that common sense was a little more common.

"Still humping the American dream" HT- Fear and loathing
05-30-03 08:09
No 436488
      hehehe... clever... ive broken one by banging...  Bookmark   

hehehe... clever... ive broken one by banging on it with a glass rod... someone recomended to me to pump air in... lets just say thats not a good idea and leave it at that....
(Hive Addict)
05-30-03 08:22
No 436491
      And just in case your stopper is stuck as well...
(Rated as: good idea!)

As we are on the topic now... I'm pretty sure many bees have encountered problems with stuck stoppers. What I see most ppl doing is trying to turn around the stopper, so it might get loose. Wrong thing to do! It will only get stuck harder. The following picture should illustrate what you'd have to do:

Do not turn around the stopper, just wiggle it a bit to the left and to the right. Don't use brute force. Think you're giving a nipple masage. Do it gentle and with care. Eventually, the stopper will give up its life as stucked-stopper and come out. It can take a while, so you are warned. Don't tell me this is bogus because you have been trying it for more than 5 minutes. It can take a while... My record is ca 20 minutes! A stoppered flask containing 10% KOH, unopened for over half a year... but the stopper gave up tongue.

The faster you run, the quicker you die.
05-30-03 15:01
No 436570
      pipettes are fragile!  Bookmark   

swih had similar experience...had lye locked sep funnel after adding salt.SLOWLY poked pipette into valve opening,but just once with a LIIIItle too much pressure,& "SNAP" goes the pipette.took him a while to fish that out!
(Hive Bee)
05-30-03 20:14
No 436633
      There is an error in the threads topic.  Bookmark   

There is an error in the threads topic. This isn't about stuck stopcocks but stuck stoppers.

Edit: Good point, I have now fixed that /Rhodium

fear fear hate hate
(Hive Bee)
06-02-03 00:43
No 437066
      Stopcock?  Bookmark   

Whe a stopper wonīt move I always gently tap the edge of the table with the stopper(just like all other chemiststongue). This also gives the desired motion to get it out...After having broken a glass stopper with my own hand (resulting in a nice cut) I donīt even think about twisting them again...

In the beginnerīs mind there are many possibilities, but in the expertīs mind there are few.
06-02-03 03:52
No 437096
      Stuck stoppers  Bookmark   


Also: http://www.ilpi.com/inorganic/glassware/stopcocks.html

Drug use carries a monkey-back guarantee.