Chemistry of water -Part 10-

Peroxides and oxygen water:

Peroxides are substances with an oxygen-oxygen bond that cleaves at high temperatures and are defined as having an oxygen degree of oxidation of (-1).
As an example: Barium peroxide BaO2 is obtained by heating barium with oxygen gas under pressure:

2BaO+ O2 ====== 2BaO2

If the pressure is decreased, it transforms back into barium oxide and breaks down. Industrial oxygen separation has long been accomplished using this method.

Water and peroxides react to produce hydrogen peroxide (oxygen water), but sulfuric acid and barium peroxide react to produce hydrogen peroxide in industrial quantities:

Ba2 + H2SO4 ===== BaSO4 + H2O2

Under low pressure, the solution evaporates, the barium sulfate precipitate is separated, and the solution is then condensed. As a result, the solution will contain 30% hydrogen peroxide. In the industrial setting, oxygenic water is currently produced through the electrolysis of a sulfuric acid or ammonium sulfate solution using a high-intensity electric current and soft platinum electrodes. Then the resulting solution is distilled under reduced pressure.
According to the reaction, oxygenated water easily dissociates:

2H2O2 ===== 2H2O + O2 + 44 K.Cal

The reaction is sped up by heat, sunlight, metal impurities. Therefore, oxygen water is stored away from heat in bottles that shield it from light's effect, and organic materials are added to stop it from quickly decomposing.

Pure oxygenated water is a colorless liquid with freezing and boiling points of 0.9 °C and 101.4 °C, respectively.

The shape of the hydrogen peroxide molecule in the gas phase.

Although it has a limited capacity for sterilization, the diluted oxygen water solution is used to treat wounds. When it comes into contact with blood or pus, it disintegrates and releases oxygen gas, which mechanically aids in the removal of dirt from the wound.

References:

• Kada, Imene- Double ionisation de la molécule d’eau par impact d’électrons- Phd thesis

• Pezzella, Marco. Molecular dynamics at water interfaces: from astrophysical to biochemical applications. 2020, Phd Thesis no:13717, University of Basel, Faculty of Science.

• [General and inorganic chemistry book- M. Shkhashirou- H. Birqdad- Y. Qodsi- University publications. Algeria]

• Berend Ensing; geboren te Delfzijl- Chemistry in Water. Phd Thesis. University of Amsterdam- 2003

• [AQUAPROX- Livre: Traitement des eaux de refroidissement. Imprimé en France par EMD S.A.S- 53110 Lassay-les-Chateaux. N° d'imprimeur: 15566- Dépot légal: juin 2006. N° 842- Cyclus print 90°]