Non-Chemical Lab glass

[solar seeker]

Ok after looking over the glass ware it looks like that Erlenmeyer flask (largest one on the top right first picture) is connected to something air tight that's connected to a rubber tube. I would use this or the large tube bottom left ,which also looks glass and air tight, as the reaction vessel. Then I would take some rubber tubing and connect it to the reaction vessel with glass pipette (tube) on the other end. I would then put the glass tube into either the other large tube on the bottom left of the first picture or into one of the round bottom flasks top left first picture and fill that other container half full with either hydrogen peroxide (30% is better) or water. So the way this works is when the reaction is going it builds pressure which forces the fumes through the tubes into the collection vessel where it reacts with the water or hydrogen peroxide to make more of whatever acid you're processing with which is commonly aqua regia which will make nitric acid. This process only reduces the fumes produced so there will still be dangerous quantities of fumes that still escape.

 

[4metals]

Be careful performing digestions in an ehrlenmeyer flask. Until you are familiar with the reactions and how violent they can become, using a vessel that tapers off towards the top is an accident waiting to happen. As a reaction rises in the flask, the area it has to expand decreases and it moves upward even faster. Not a situation someone new at this should be in. Use a straight walled flask so you don't accelerate the reactions rise. And always leave a t least 50% of the vessels volume to allow for a rise.

 

[Harold_V]

Be careful performing digestions in an ehrlenmeyer flask. Until you are familiar with the reactions and how violent they can become, using a vessel that tapers off towards the top is an accident waiting to happen. As a reaction rises in the flask, the area it has to expand decreases and it moves upward even faster. Not a situation someone new at this should be in. Use a straight walled flask so you don't accelerate the reactions rise. And always leave a t least 50% of the vessels volume to allow for a rise.

I heartily endorse your comments, 4metals. I'm at a loss to understand why anyone chooses an Erlenmeyer flask for these operations, and for the precise reason you mentioned, to say nothing of the difficulty in keeping them clean.

Harold