H2O2 stability? Is 30% hydrogen peroxide still good after 3 years? - (Feb/12/2009 )

H2O2 stability? Is 30% hydrogen peroxide still good after 3 years?

Is there a way for me to check?

Well.....I am not sure about the stability...I would expect it to go bad as its a good oxidizing agent.

I remember estimating H2O2 by iodimetry wherein you use KI solution and oxidize it to I2 (color change can seen visually) and then estimating I2 by oxidizing thiosulfate ions to perthiosulfate. This is followed by a back calulation to find conc. of H2O2.

Check any standard chemistry book for details, its a very well known reaction to estimate H2O2 concentration.

Hope it helps.

TC

If I were you, I would buy a new bottle.

Yeah to think about it, I would do the same.....buy a new bottle

However, it did remind me of some fun experiments that we did during masters.....been ages that I have touched a burette or seen any colour change reaction working in my hand

TC

the stability and usability also depend on your storage conditions and usage.

we store 30% h2o2 sealed tight, in the cold and have been able to use the same bottle for several years in peroxidase reactions for deposition of colored product (dab).

it also remained useful for dissolving polyacrylamide.

however, when in doubt, throw it out.

MKR on Feb 13 2009, 01:13 AM said:

If you stored it properly, it should last. I dont know if there is way to check if its good or not.

One drop on a healing wound will give you the answer.
If it fizzes – it's good.
Though, I don’t know about the percentage.

30% hydrogen peroxide is caustic. The solution used for wounds is 3%. Don't try this at home with 30% peroxide!

It was meant as a jock.
DO NOT TRY IT AT HOME!!!!