Does H2O2 Spontaneously Decompose?

Hydrogen peroxide can decompose spontaneously into water and oxygen. It usually acts as an oxidizing agent, but there are many reactions where it acts as a reducing agent, releasing oxygen as a by-product. It also readily forms both inorganic and organic peroxides.

How long does H2O2 take to decompose?

Hydrogen peroxide is relatively unstable and decomposes quickly. In a sealed container, hydrogen peroxide lasts approximately 3 years. However, as soon as you open the container, it starts to break down. You might be surprised to learn that it's only effective for 1 to 6 months once the container is opened.

Does hydrogen peroxide decompose in air?

Small amounts of gaseous hydrogen peroxide occur naturally in the air. Hydrogen peroxide is unstable, decomposing readily to oxygen and water with release of heat. Although nonflammable, it is a powerful oxidizing agent that can cause spontaneous combustion when it comes in contact with organic material.