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also if you have any knowledge in this area what are the dangers of this experiment?

2006-12-25 18:16:48 · 4 answers · asked by psycho 3 in Science & Mathematics Chemistry

4 answers

Excuse me, but why are you going to the hassle of a complex redox reaction (apart from the explosive dangers of all redox reactions, especially where as powerful an oxidising agent as KMnO4 is concerned) to generate oxygen from hydrogen peroxide?

H2O2 readily decomposes to give oxygen, the reaction being catalysed by a number of metals and metal oxides, most commonly MnO2. Basically therefore, all you need to do is warm H2O2 in the presence of MnO2 catalyst.

As regards the volume you need, look at the strength of the hydrogen peroxide. H2O2 strength is normally quoted as volumes (e.g. 20 volumes etc). What this means is that 1 volume of H2O2 will generate 20 volumes of O2 at stp.

So, assuming a 20 volumes H2O2,
1L of H2O2 gives 20L of O2,
So 0.1L (100mL) of H2O2 should give you 2L of O2 (at stp...at rtp you will get more than 2L because rtp is higher temperature than stp, and therefore the 2L expand thermally to give you a volume greater than 2L).

The O2 obtained in this way will probably be "wet". Bubble it through concentrated sulfuric acid to dry it.

2006-12-25 18:42:44 · answer #1 · answered by claudeaf 3 · 0 0

I assume that the conditions are STP. 2 liters of elemental oxygen would be 2/22.4 (.089mol). 0.089mol O2 = .178mol H2O2 = 6.07g H2O2

Standard solutions are 30% H2O2. =~20mL of H2O2 stock solution. However since yields are never 100%, aim for 30 - 50mL H2O2.


Potassium permangamate isn't actually a reagent merely a catalyst (MnO2 and elemental silver also work), so a measured amount isn't necessary. However, a fine mesh solid will work much better than larger crystals. Both KMnO4 and MnO2 come in this form so it shouldn't be that difficult to obtain.

A small scoop should be fine.

Safety?

Both reagents are not something you want to get on your skin. Although not fatal, H2O2 stock solution is a strong oxidizer and will burn if not removed. KMnO4 is also an oxidizer and with turn you fingers purple then brown (nastly stain). Use glove and aprins and all should be well.

2006-12-26 02:32:53 · answer #2 · answered by Ross P 3 · 0 0

Why not just go to a welding shop and get a can of pressurized oxygen?

2006-12-26 02:24:01 · answer #3 · answered by fish guy 5 · 0 0

idk sorry

2006-12-26 02:23:42 · answer #4 · answered by NONAME 2 · 0 1

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