Does hydrogen peroxide expire?

Sure it does. If you’ve ever poured hydrogen peroxide onto a plant and the expected fizz didn’t happen, its likely your bottle of hydrogen peroxide has turned into O2.
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The 3% hydrogen peroxide solution disinfectant typically has a shelf life of a year. If the bottle seal is broken, it may last 30-45 days. Exposure to oxygen starts a reaction that forms water.

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The solution can be further compromised by through contamination by dipping foreign objects like your finger in the bottle. The effectiveness of the remaining liquid is guaranteed to be lackluster. Light is also a no no.

Any open bottles laying around the house are best replaced after a year even when sealed. If ever been opened, its effectiveness is long gone.

Pick up a fresh bottle when you need it. Its cheap enough to use a fresh bottle each time.

Reference:
http://answers.webmd.com/answers/5009434/does-hydrogen-peroxide-have-an-expiration-date
http://chemistry.about.com/b/2013/07/09/hydrogen-peroxide-shelf-life.htm

http://www.thenakedscientists.com

Thanks for reading.

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The Aquatic Plant Society
The Aquatic Plant Society is dedicated to promoting the science and aesthetic of the Planted Aquarium. We are committed to a responsible and environmentally conscious pursuit of the hobby, and invite all to share in and add to our knowledge.