nagyepf
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Hydrogen peroxide from ozone and water?
I have made a high voltage generator.The discharge can produce so much ozone that there is a very stonng smell after only 5 seconds of operation.
I was wondering if it is possible to make H2O2 from O3 and H2O.
What are your rhoughts about it?Unfortunatly I can only find 3% H2O2 and its quite expensive.Even my chemistry teacher doesnt know where it is
available in higher concentrations for cheap.
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Ubya
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| Quote: | H2O + O3 → H2O2 + O2
has a negative Gibbs energy of -46.5 kJ/mol, so theoretically, this reaction should occur but, the decomposition of O3 to O2 by the reaction,
2 O3 → 3 O2
has a Gibbs energy of -326.4 kJ/mol so the decomposition of ozone is favored over the formation of hydrogen peroxide. As a consequence, I would say
no, ozone is not likely to react with water to form hydrogen peroxide. The ozone will decompose to form oxygen instead. |
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feel free to correct my grammar, or any mistakes i make
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hissingnoise
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H2O2, though not cheap, is far cheaper than ozone ─ it's available in health shops, oddly enough at 35% conc..
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Texium
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Thread Moved
23-2-2019 at 10:06 |
nagyepf
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Nobody needs to buy ozone.Just get a gigh voltage generator or a UV C lamp,like this:
https://www.youtube.com/watch?v=WjKkgkbRSgY
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DavidJR
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I doubt this will work. If it was that simple then wouldn't this method have been used industrially? Instead the far more complicated anthraquinone
process is used.
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hissingnoise
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The half-life of ozone at NTP is about 30 minutes, so it cannot be bought or supplied, period...
Its smell is such that it's readily detected at PPB in air and this often fools k3wls into thinking their apparatus is producing ozone at a high rate,
when in reality, only little more than trace amounts are being formed.
It is so easily detected by smell that its given name is from the Greek word for smell.
Its cost of production is so high that intense effort to raise the efficiency of the reaction have been ongoing since Van Marum's day...
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unionised
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Quote: Originally posted by hissingnoise  |
Its cost of production is so high that intense effort to raise the efficiency of the reaction have been ongoing since Van Marum's day...
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And those efforts have worked.
Large scale ozone production now costs about a dollar per pound.
https://www.researchgate.net/figure/Example-ozone-production...
I'd not expect a "home brew" system to be so efficient.
However a commercial small generator like this
https://www.ebay.co.uk/itm/ET-200-Aquarium-Ozone-Generator-2...
might be useful to the home chemist.
How well you can use it to make peroxide is a different question.
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hissingnoise
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Ozone doesn't react with water, to any practical extent, unfortunately.
If it did, ozone would be storable, in a sense...
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unionised
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I'm fairly sure you can photolyse ozone to give essentially a free oxygen atom (and O2) .
And I could be talked into believing a reaction of "O" and H2O to give H2O2
It seems remarkable that Ajkoer hasn't popped up in this thread.
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clearly_not_atara
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| Quote: Originally posted by DavidJR | | I doubt this will work. If it was that simple then wouldn't this method have been used industrially? Instead the far more complicated anthraquinone
process is used. |
One is an ozone production method, the other produces H2O2. Anthraquinone to H2O2 is actually a very efficient method that produces high concentration
peroxide, while corona discharge ozone tops out around 10% IIRC.
[Edited on 04-20-1969 by clearly_not_atara]
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VSEPR_VOID
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oi m8, u got a permit fo dat?
Within cells interlinked
Within cells interlinked
Within cells interlinked
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morganbw
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Damn man, what is it with this shit you are posting.
The entire world which this forum operates in does not know this bullshit slang you are slapping around.
I just wasted too much of my life trying to understanding wtf you were saying.
Stick your kool up your ass, if you wish to say something then just say it.
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Herr Haber
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Vacations maybe ?
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