fob - 6-1-2005 at 11:58
Does anybody know of a reaction that will release oxygen at room temperature with mild reactants?
runlabrun - 6-1-2005 at 12:15
electrolysis of water.
Easy, cheap, and only req a small amount of sulphuric acid as a catalyst.
-rlr
fob - 6-1-2005 at 12:45
i can't use electolysis,
i need a release of oxygen as a result of a chemical reaction between 2 components
JohnWW - 6-1-2005 at 12:54
The decomposition of hydrogen peroxide solution as the result of impurities, especially transition metals. Also the mutual decomposition of hydrogen
peroxide and permanganate.
BromicAcid - 6-1-2005 at 13:36
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 - 6-1-2005 at 14:47
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 - 6-1-2005 at 15:07
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 - 6-1-2005 at 15:46
Small amounts of iodine also work as a catalyst.
Protium - 6-1-2005 at 20:31
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.
chloric1 - 7-1-2005 at 03:54
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!
mick - 29-1-2005 at 10:26
If you use a catalyst with H2O2 try dripping the H2O2 on to the catalyst to control the reaction.
mick