This instability was present owing to traces of impurities (transition-metal salts). Pure Hydrogen Peroxide was initially believed to be unstable since early experiments to separate it from the water, which is present during synthesis,- all failed. In 1811, ThГ©nard and Joseph Louis Gay-Lussac synthesized sodium Peroxide. This method was followed from the end of the 19th century until the middle of the 20th century. An advanced version of ThГ©nard's method used hydrochloric acid, followed by addition of sulfuric acid to precipitate the barium sulfate by-product. He described it as eauoxygГ©nГ©e (French: oxygenated water) вЂ“ which came to be known as Hydrogen Peroxide. After nineteen years, Louis Jacques ThГ©nard stated that this compound could be used for the preparation of a previously unknown compound. In 1799, Alexander von Humboldt synthesized barium Peroxide, one of the first synthetic Peroxides, as a by-product of his attempts to decompose air. Peroxidases are the enzymes that use or decompose Hydrogen Peroxide. It can be found in biological systems including the human body. Hydrogen Peroxide is generally stored with a stabilizer in a weakly acidic solution since it is unstable. As this compound is unstable, it slowly decomposes in the presence of light. Concentrated Hydrogen Peroxide, also known as 'high-test Peroxide', is a reactive oxygen species and has been used as a propellant in rocket propulsions. Hydrogen Peroxide has basic uses as an oxidizer, bleaching agent and antiseptic. It is the simplest Peroxide (since it is a compound with an oxygen-oxygen single bond). Hydrogen Peroxide is a pale blue, clear liquid, slightly more viscous than water in its pure form. Two molecules of Hydrogen combine with two molecules of oxygen to form Hydrogen Peroxide.

Hydrogen Peroxide is a highly unstable chemical compound.

Hydrogen peroxide