What happens to hydrogen peroxide when it sits on the shelf for a long time?
821555
H2O2 gradually decomposes to water and oxygen. The process is catalyzed by heat, light, base, and traces of heavy metal ions (such as iron, manganese, etc), but not Tin. \nTin surprisingly, along with many other organic compounds, such as acetanillide are used as stabilizing agent at ppm level.\nIt's estimated when properly stored at 15-25 oC under dark condition in plastic bottle, free from contaminants ACS grade H2O2 degrades at a rate of 1-3 %/year. So it's not that bad.
460095
*Advertisement*\n*voice-over*\n"Are you tired of factually incorrect answers?"\n"Are you tired of answers that make a mockery of your question?"\n"Are you disappointed that your good question didn't get the response it deserved?"\n\nNow, there is no need to worry, as we introduce you to the most reliable answering machine- \nBATMAN!! *Cheers*\n\nTa daaaa..\n\n*End of commercial*\n\nHi Jade,\n\nI've got the answer! Here it comes- \nPeroxide bubbles because of constant production of oxygen gas as a result of spontaneous decomposition of peroxide.\n\nThe oxidation state of oxygen in peroxide(H2O2) is (-1) i.e. one electron for each oxygen atom.\n\nIn water (H20), the oxidation state is (-2) i.e two electrons for one oxygen atom. \n\nIn an oxygen molecule (O2), the oxidation state is zero. \n\nNow, the aqueous solutions of hydrogen peroxide spontaneously decomposes like this-\n\nOne molecule of Peroxide (liquid) ----> One molecule of Water (Liquid) + Half molecule of Oxygen (gaseous)\n\nSymbolically-\nH202 (l)   -------> H2O (l) + (1/2)O2 (g)\n(Dammit, how do I put numbers in sub-script and super-script?)\n\nNow, the Oxygen produced here causes production of bubbles.\n\nThis decomposition occurs slowly but the presence of metal surfaces, traces of alkali (present in glass) strongly catalyze the reaction. \n\nSo, if you don't want all your peroxide to convert into water, don't keep it in metal or glass bottles! Keep it in wax-lined glass or plastic vessels in the presence of stabilizers like Urea.\n\nIt is also decomposed by exposure to light. \n\nAlso, keep it away from dust, dust (even in small quantities) induces explosive decomposition.
900245
If you open it up, then put a lot of peroxide on it.  It'll foam up a bit, then dab it dry with some toilet paper or something and put Neosporin on it.  It should be gone a few days if you do that every day.
1181173
Peroxide will get blood off.
266310
Im a date watcher ,so nothing is too old.I go through the fridge and freezer every garbage day and get rid of questionable things.I wont even buy a pop at the store if the sell by date is within a month.When in doubt throw it out!Many times my wife asks where something went and gets upset with me cuz i threw it out and it may only be from yesterday.Oh well better safe than sorry.
453542
Hydrogen Peroxide will get it out.
266965
PEROXIDE IS GOOD, ALSO I USE ANTIBIOTIC CREAM IT DRIES IT UP FAST
25121
The principle works, but the technical applicability is rather low.\n\nYou can use hydrogen peroxide solution in higher concentrations, as used by hair stylists or as concentrate for cleaning contact lenses. The reaction speed will be increased considerably. Unfortunately, reaction heat will become an issue, too, and oxidation of potatoes as well.
447929
a dark bottle is used b/c light will destroy the peroxide...it's very light sensitive.\n\nas for the second question...i have no clue.
533378
throw it away. it has a long term side effect.
783386
If the medication was stored in the container in which it was received in an indoor cabinet but not in the bathroom medical study suggests that nearly all medications retain nearly all of their potency for at least 5 years after their expiration date.  I hope that your headache goes away.
1171310
Tinned food is hermetically sealed and sterilised at a high temperature, so there are no bacteria to destroy the food. Usually there is no need for any preservatives, though I think some are used to help tinned vegetables retain their colour.\n\nIt's only once it's opened that one has to store it out of the tin and in the fridge. Once bacteria get access to the food it will go off as quickly as fresh food and once it's opened, the acid in the food can begin to dissolve the metal of the can where the lining has been damaged.\n\nTins of food have been found which are still ok to eat after 50 years or more but early tinned food sometimes used lead to seal the cans which made the food unfit to eat before very long.\n\nWikipedia has this:\nhttp://en.wikipedia.org/wiki/Cannery
217261
Nothing if it was a small amount.  Some believe in drinking food grade peroxide for health benefits.
36166
You can rinse with Hydrogen peroxide just like regular mouthwash. It tastes TERRIBLE though. You are better off getting some Listerine(c)
139261
It is kept in a dark plastic or glass bottle. H2O2 is decomposed dy light into hydrogen and oxygen gas, therefore, you will always find it in a dark bottle.\nThe bottle also needs an airtight seal because the decomposition takes place in the dark also (but at a much slower pace) so by trapping the gases formed, the decomposition is stopped and the H2O2 is preserved (which is why we bottle it in the fist place)
802262
soak it in hydrogen peroxide overnight then rinse it off with water before the next time you put it in your mouth
613729
This experiment is often used as a fun science demo for kids...It is called "Elephant's Toothpaste." Hydrogen peroxide is catalytically decomposed by the potasium iodide. By the idodide ion, actually. Oxygen gas is rapidly formed. You put a squirt of dish soap and a drop of food coloring into 50 mL of 30% hydrogen peroxide... Then when you add 1 or 2 grams of potassium iodide... the released oxygen gas is trapped in soap bubbles... you get a huge amount of foamy suds!!!\n\nThe reaction sequence is as follows:\n\nH202 (aq) + I- (aq) --> H20 (l) + OI- (aq)\n\nH202 (aq) + OI- (aq) --> H20 (l) + O2 (g) + I- (aq) \n\nThe iodide ion is not consumed by the reaction, therefore it is a CATALYST.