Over around 60% peroxide concentration the available energy from decomposition is sufficient to vaporize all of the water, leaving (potentially superheated) steam and hot oxygen. As such, it really shouldn’t be poured into anything like a graduated cylinder, volumetric flask or beaker that is potentially contaminated or intentionally containing a catalyst. A watch glass, Petri dish, or pavement would be a better choice. With a proper setup, it isn’t unreasonable to use a stoppered dropping funnel with pressure equalization and a catalyst in a two neck flask to measure the volume of oxygen evolved as a quick and dirty assay though there are probably better methods of assay.
@@peterb7615 Do you know if it's possible to get a lot of 30%, boil it down to get a higher concentration, and make more of that higher concentration to do the same thing instead of using a vacuum?
@@theamericanchemist3745if the temperature gets too high the peroxide starts to break down. The vacuum lets you boil off water at a lower temperature and get a better yield - and concentration.
Over around 60% peroxide concentration the available energy from decomposition is sufficient to vaporize all of the water, leaving (potentially superheated) steam and hot oxygen.
As such, it really shouldn’t be poured into anything like a graduated cylinder, volumetric flask or beaker that is potentially contaminated or intentionally containing a catalyst.
A watch glass, Petri dish, or pavement would be a better choice.
With a proper setup, it isn’t unreasonable to use a stoppered dropping funnel with pressure equalization and a catalyst in a two neck flask to measure the volume of oxygen evolved as a quick and dirty assay though there are probably better methods of assay.
Another (cheaper) catalyst could be potassium permanganate, chrystals or concentrated solution
Potassium permanganate also seems to work well despite the stabilizers.
Mate, graduated cylinders aren't made for high temperatures. This is a slim one, you're lucky it didn't break. Use a bloody beaker next time.
Is there any other way to make hydrogen peroxide a higher concentration than 3 percent?
I have a video showing how to take 3% H2O2 up to >90%. You can buy 30% easily
@@peterb7615 Do you know if it's possible to get a lot of 30%, boil it down to get a higher concentration, and make more of that higher concentration to do the same thing instead of using a vacuum?
@@theamericanchemist3745 in a beaker at around 200f-220f for a few hours would concentrate the solution
@@theamericanchemist3745if the temperature gets too high the peroxide starts to break down. The vacuum lets you boil off water at a lower temperature and get a better yield - and concentration.
Okay, but what'll happen if you ignite it?
It won't ignite. It is oxidizer only (+water)