thehexlibrary - 28-5-2020 at 21:05
hi guys, thanks for taking the time to help me
I've been having this problem for awhile and can't figure out what to do. I'm running a reaction that generates ammonia gas in a classic distillation
set up.
The ammonia gas runs through the glassware, into tubing, and into a beaker of water, where it can bubble through and generate an ammonia solution.
The problem is, after a couple seconds a bubbling, water starts getting sucked back up the tubing, and into the glassware.
I have no idea why this is happening, maybe the ammonia dissolving in the water creates a pressure difference that causes the water to move back up?
I kmow its supposed to be possible to bubble ammonia through a water solution, i just don't know how to fix this. Does anyone know a way to prevent
water from flowing back through the setup when trying to bubble ammonia through?
B(a)P - 28-5-2020 at 21:18
Take a look here http://www.sciencemadness.org/talk/viewthread.php?tid=3836
thehexlibrary - 30-5-2020 at 10:45
thanks so much! upside down funnel seems to be the answer to my questions! will try it out and see how things work
draculic acid69 - 30-5-2020 at 18:51
Also putting a spaghetti sauce jar with two nipples in the lid between the gas source and the water absorption vessel helps prevent accidents. If I
remember correctly the jar should be raised higher than the other two helps to prevent suckback.
thehexlibrary - 31-5-2020 at 06:34
draculic thanks so much! the pic is super helpful too! 'Preciate it!