Hi, recently I found a glass bottle with 0.5L of 10+ years old hydrogen peroxide - it mostly decomposed, because the reaction with KMnO4 is very slow
(hard to see odd bubbles coming off). It still colors starch- iodide paper faint blue, I estimate it's concentration <1% (won't worry to waste time
on titration). Question - what to do with it, where can it be utilized having such a low concentration ?bfesser - 30-9-2013 at 07:26
It can be utilized in cleaning the sink drain.papaya - 30-9-2013 at 08:37
I hoped to convert it into something useful (even the yield of the X is 10g ) - what about peroxychromates, does it work with concentrated peroxide
only? woelen - 30-9-2013 at 08:49
If it is so weak that a reaction with KMnO4 hardly shows any bubbles, then it is much less than 1%. Even a 1% solution still gives a good fizzle with
KMnO4.
Just dump it and use the glass bottle for storing something more useful.Fantasma4500 - 30-9-2013 at 08:55
you could concentrate it perhaps
simply keep heat at 100*C max, or well just keep it at a fast evaporation rate with only small bubbles, 70*C should work..
plante1999 wrote about it, IIRC approx 95% yield, as in 5% H2O2 lost, concentrating was as much as 80% (again, not 100% sure on this)bfesser - 30-9-2013 at 11:09
Drain cleaner isn't useful? With such a low (<em>estimated</em>
concentration, I doubt you'll come up with anything that's worth the effort. If you're unwilling to "waste time" titrating it, why waste time trying
to use it?
Just dump it and use the glass bottle for storing something more useful.
Do this and stop wasting all of our
time.
[Edited on 30.9.13 by bfesser]bismuthate - 30-9-2013 at 12:26
just mix it with vinegar or HCL and let it sit in some slightly dirty glassware for a while.
(it won't work very fast due to the low concentration)Mailinmypocket - 2-10-2013 at 11:49
Mix it with epsom salts and give yourself a foot bath to relax from racking your brain by thinking of how to use it
concentration, I doubt you'll come up with anything that's worth the effort. If you're unwilling to "waste time" titrating it, why waste time trying
to use it? 
