Why Hydrogen Peroxide is Kept in Dark Plastic Bottles?

The chemical structure of hydrogen peroxide is shown below:

Due to the Oxygen-Oxygen link, Hydrogen peroxide breaks down slowly at room temperature, but quickly in presence of heat, certain catalysts (e.g., metal ions), and light.

2 H2O2 → 2 H2O + O2

Brown-colored containers limit the wavelengths of light that can be absorbed by the solution, restricting the initiation of the disproportionate reaction.

Originally written on May 22, 2013 and last modified on November 22, 2013.

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