Mostly, what I'd like to do is make sure that only O2 is being produced, and no harmful gases. I was thinking that as long as none of the chemicals produced are dangerous gases it might be a bit of a laugh if I could have my own mini oxygen bar, and if I could make sure that nothing other than O2 is produced, I'm sure I could do all sorts of fun things with it.
I've tried this before, since I read that the reaction listed above should happen, and it seemed reasonable. But at the same time, I wasn't sure that I wouldn't end up with something other than oxygen, so I avoided breathing in the gas(es) that was/were produced.
I have some pH paper lying around, so I think I'll have a look at the pH of the mixture that's left over to see if that gives any useful information.
Also, if this is at all helpful, here's how the reaction goes down (when using about a tablespoon of each):
As soon as the two liquids are mixed, large bubbles start forming rapidly, but this doesn't go on for long. The reaction usually goes on at a much slower pace for the next 30 seconds or so. Any gas(es) that form have no apparent colour. It seems as though the reaction is very slightly exothermic, but the resulting mixture is probably at about 31 C, as it feels similar to water being used to start off yeast.