Hydrogen peroxide
[CAS# 7722-84-1]

Identification

• Classification: Inorganic chemical industry >> Inorganic salt >> Oxides and peroxides >> Non-metal oxides and peroxides
• Name: Hydrogen peroxide
• Molecular Formula: H₂O₂
• Molecular Weight: 34.01
• CAS Registry Number: 7722-84-1
• EC Number: 231-765-0
• SMILES: OO

Properties

• Solubility: miscible (water), soluble (ethanol, ether) (Expl/)
• Density: 1.4067 g/mL (25 ºC) (Expl.)
• Melting point: -40 ºC (Expl.)
• Index of Refraction: 1.335 (Expl.)
• Boiling point: 126 ºC (Expl.)

Safety Data

• Hazard Symbols: GHS03;GHS05;GHS07 Danger
• Hazard Statements: H271-H302-H314-H318-H332-H335-H412
• Precautionary Statements: P210-P220-P260-P261-P264-P264+P265-P270-P271-P273-P280-P283-P301+P317-P301+P330+P331-P302+P361+P354-P304+P340-P305+P354+P338-P306+P360-P316-P317-P319-P321-P330-P363-P370+P378-P371+P380+P375-P403+P233-P405-P420-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Skin corrosion	Skin Corr.	1A	H314
Acute toxicity	Acute Tox.	4	H302
Acute toxicity	Acute Tox.	4	H332
Oxidising liquids	Ox. Liq.	1	H271
Serious eye damage	Eye Dam.	1	H318
Specific target organ toxicity - single exposure	STOT SE	3	H335
Chronic hazardous to the aquatic environment	Aquatic Chronic	3	H412
Oxidising liquids	Ox. Liq.	2	H272
Acute toxicity	Acute Tox.	3	H331
Skin corrosion	Skin Corr.	1B	H314
Flammable liquids	Flam. Liq.	2	H225
Acute toxicity	Acute Tox.	4	H312
Substances or mixtures corrosive to metals	Met. Corr.	1	H290
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411
Acute toxicity	Acute Tox.	3	H301
Skin corrosion	Skin Corr.	1	H314
Skin irritation	Skin Irrit.	2	H315
Eye irritation	Eye Irrit.	2	H319
Acute toxicity	Acute Tox.	2	H330

• Transport Information: UN 2015;UN 2014;UN 2984

Discovory and Applicatios

Hydrogen peroxide (H₂O₂) is a simple yet highly versatile chemical compound that has found a wide range of applications in various industries, from healthcare to manufacturing. It is a colorless liquid with strong oxidizing properties and is known for being a powerful disinfectant and bleaching agent. Hydrogen peroxide is typically produced by the autoxidation of anthraquinone or through electrochemical processes. Its discovery dates back to the early 19th century, and it has since become one of the most commonly used chemicals worldwide.

Hydrogen peroxide was first discovered in 1818 by the French chemist Louis-Jacques Thénard. Thénard obtained hydrogen peroxide by reacting barium peroxide with dilute acids. He was able to isolate the compound and demonstrated its chemical properties, including its ability to release oxygen when decomposed. The name "hydrogen peroxide" was derived from its molecular composition, with "hydrogen" representing the H atoms and "peroxide" referring to the presence of an oxygen-oxygen bond.

The compound's strong oxidizing properties were quickly recognized, and by the mid-19th century, hydrogen peroxide began to be used in a variety of applications. It gained popularity as a bleaching agent for textiles and paper, where its ability to break down color and organic materials was highly valued. This application continues today in industries like pulp and paper, where hydrogen peroxide is still widely used to bleach and brighten materials without the use of harsh chemicals like chlorine.

In the medical field, hydrogen peroxide's disinfectant properties have made it an important tool for sterilization and wound care. When applied to cuts and abrasions, hydrogen peroxide releases oxygen, which helps to clean the wound and kill bacteria. It is also used as a mouthwash and in dental care products, where it aids in the prevention of gum disease and tooth decay. However, its use as a wound disinfectant has been limited in recent years, as more research has shown that it can damage healthy tissue and slow down the healing process when used in high concentrations.

Hydrogen peroxide also plays a critical role in the field of environmental cleanup. Its oxidizing properties make it effective for breaking down pollutants in water and soil. For example, it is used in wastewater treatment to neutralize harmful substances and to purify water in industrial applications. Hydrogen peroxide is also used in the oil and gas industries for cleaning equipment and removing contaminants from water and oil.

In the chemical manufacturing industry, hydrogen peroxide is used in the production of a variety of products, including the synthesis of other chemicals such as peracetic acid, propylene oxide, and terephthalic acid. It serves as an environmentally friendly alternative to chlorine-based chemicals in many industrial processes. Moreover, hydrogen peroxide is used in the formulation of household cleaning products due to its efficacy in removing stains, disinfecting surfaces, and deodorizing.

The compound's versatility extends to its role as an oxidizing agent in a variety of other industries. Hydrogen peroxide is used in the production of semiconductors and electronics, where it plays a part in cleaning and etching processes. It is also used in rocket propulsion systems as a propellant due to its ability to release large amounts of oxygen when decomposed.

Despite its widespread use, hydrogen peroxide is a reactive chemical that requires careful handling. At higher concentrations, it can be corrosive, and its decomposition can release oxygen gas, which can cause pressure buildup in sealed containers. Consequently, hydrogen peroxide is often stabilized and stored in dark containers to prevent decomposition caused by light exposure.

In conclusion, hydrogen peroxide is a chemical compound with a rich history and a broad spectrum of applications. From its early use in bleaching and disinfecting to its current role in healthcare, environmental management, and chemical manufacturing, hydrogen peroxide has proven to be an invaluable substance. As research into its uses continues, new applications for hydrogen peroxide are likely to emerge, solidifying its place as one of the most widely used chemicals in the world.

References

1862. Ueber einige neuen höchst empfindlichen Reagentien auf das Wasserstoffsuperoxyd. Zeitschrift für analytische Chemie.
DOI: 10.1007/bf01430085

2025. Ingenious construction of a magnetic-recyclable photo-Fenton catalyst ZnFe2O4@MIL-88A(Fe) and its adsorption-degradation activity toward levofloxacin. Journal of environmental sciences (China), 147.
DOI: 10.1016/j.jes.2024.04.043

2025. Determination of persulfate based on the principle of the oxidation of chloride ion. Journal of environmental sciences (China), 146.
DOI: 10.1016/j.jes.2023.11.028