fob
Harmless
Posts: 2
Registered: 6-1-2005
Member Is Offline
Mood: No Mood
|
|
Releasing Oxygen
Does anybody know of a reaction that will release oxygen at room temperature with mild reactants?
|
|
|
runlabrun
Hazard to Others
Posts: 172
Registered: 4-12-2004
Member Is Offline
Mood: No Mood
|
|
electrolysis of water.
Easy, cheap, and only req a small amount of sulphuric acid as a catalyst.
-rlr
|
|
|
fob
Harmless
Posts: 2
Registered: 6-1-2005
Member Is Offline
Mood: No Mood
|
|
i can't use electolysis,
i need a release of oxygen as a result of a chemical reaction between 2 components
|
|
|
JohnWW
International Hazard
Posts: 2849
Registered: 27-7-2004
Location: New Zealand
Member Is Offline
Mood: No Mood
|
|
The decomposition of hydrogen peroxide solution as the result of impurities, especially transition metals. Also the mutual decomposition of hydrogen
peroxide and permanganate.
|
|
|
BromicAcid
International Hazard
Posts: 3246
Registered: 13-7-2003
Location: Wisconsin
Member Is Offline
Mood: Rock n' Roll
|
|
Mixtures such as Oxi-clean that have sodium percarbonate release oxygen when dissolved in water, then there is of course hydrogen peroxide with some
sort of catalyst, manganese dioxide being the norm as John WW just said. And don't double post... ever
|
|
|
evilgecko
Harmless
Posts: 36
Registered: 2-1-2005
Member Is Offline
Mood: Decomposing
|
|
Yup hydrogen peroxide is the best way to go. Maganese dioxide can be pulled out of big cell batteries (eg 6V latern ones). Its that black annoying
substance which stains everything. I use strong 30% H2O2 and add the tiniest amount of MnO2 (about 0.1g). Anymore and its starts frothing like crazy.
|
|
|
The_Davster
A pnictogen
Posts: 2861
Registered: 18-11-2003
Member Is Offline
Mood: .
|
|
Try adding a solution of potassium permanganate to 35% H2O2. Oxygen is
released so fast that the contents of the beaker eject so soon after the addition that there is still pure H2O2 in the bottom of the beaker, that is
not decomposing. It was just as violent adding the potassium permanganate solution to this remaining H2O2 as the origional addition.
If anyone tries this, do it from a distance, permangante stains on faceshield are annoying.
The decomposition of H2O2 with a catalyst is the best non electrolytic way. Just use dilute(ish) H2O2 and a few crystalls of MnO2. No solutions of
permanganate if you want a controlled release.
[Edited on 6-1-2005 by rogue chemist]
|
|
|
neutrino
International Hazard
Posts: 1583
Registered: 20-8-2004
Location: USA
Member Is Offline
Mood: oscillating
|
|
Small amounts of iodine also work as a catalyst.
|
|
|
Protium
Harmless
Posts: 27
Registered: 25-12-2004
Location: Point Of Return (Subject To 15% Restocking Fee)
Member Is Offline
Mood: unenlightened
|
|
You could either buy an oxygen tank from your nearest welding supply shop
OR
In suitable sized flask or whatever, add 100 mL H2O. Then add about 18g sodium monopersulfate. This results in a highly acidic solution. Ad about 5 or
6g of bicarb or until slightly basic. The more bicarb you add, the faster O2 will evolve. This will continue to gently evolve O2 gas for about 5 hours
or more. Gentle swirling of flask will speed up gas production. Just pipe this wherever it needs to go avoiding flames and smoking and such.
The beautiful part about this is that it is so gentle (no crazy foaming or bumping). Sodium monopersulfate is available OTC as non-chlorine pool-shock
at your local pool and spa dealer. Bicarb, well... available anywhere.
It just depends on how you look at it...
|
|
|
chloric1
International Hazard
Posts: 1142
Registered: 8-10-2003
Location: GroupVII of the periodic table
Member Is Offline
Mood: Stoichiometrically Balanced
|
|
I used a concotion based on Clorox(R) and 3% H2O2. Sure its foams but not much more than a freshly opened Pepsi. I used this mix to turn metals into
there oxides. Works great for making copper oxide! There is no chlorine given off so it should work fine. You only have NaCl as waste!
Fellow molecular manipulator
|
|
|
mick
Hazard to Others
Posts: 338
Registered: 3-10-2003
Member Is Offline
Mood: No Mood
|
|
If you use a catalyst with H2O2 try dripping the H2O2 on to the catalyst to control the reaction.
mick
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
