papaya
National Hazard
Posts: 615
Registered: 4-4-2013
Member Is Offline
Mood: reactive
|
|
Old peroxide
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
Resident Wikipedian
Posts: 2114
Registered: 29-1-2008
Member Is Offline
Mood: No Mood
|
|
It can be utilized in cleaning the sink drain.
|
|
|
papaya
National Hazard
Posts: 615
Registered: 4-4-2013
Member Is Offline
Mood: reactive
|
|
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
Super Administrator
Posts: 7987
Registered: 20-8-2005
Location: Netherlands
Member Is Offline
Mood: interested
|
|
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
International Hazard
Posts: 1681
Registered: 12-12-2012
Location: Dysrope (aka europe)
Member Is Offline
Mood: dangerously practical
|
|
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
Resident Wikipedian
Posts: 2114
Registered: 29-1-2008
Member Is Offline
Mood: No Mood
|
|
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? Do this and stop wasting all of our
time. 
[Edited on 30.9.13 by bfesser]
|
|
|
bismuthate
National Hazard
Posts: 803
Registered: 28-9-2013
Location: the island of stability
Member Is Offline
Mood: self reacting
|
|
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
International Hazard
Posts: 1351
Registered: 12-5-2011
Member Is Offline
Mood: No Mood
|
|
Mix it with epsom salts and give yourself a foot bath to relax from racking your brain by thinking of how to use it
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
