what is the CAS of hydrogen peroxide
The Correct Answer and Explanation is:
CAS Number of Hydrogen Peroxide: 7722-84-1
Explanation
The CAS number (Chemical Abstracts Service number) is a unique numerical identifier assigned to every chemical substance described in the open scientific literature. These numbers are used internationally to provide a standardized way of identifying chemicals, regardless of naming variations across different languages and systems.
For hydrogen peroxide, the CAS number is 7722-84-1. This compound consists of two hydrogen atoms and two oxygen atoms, giving it the chemical formula H₂O₂. It is a pale blue liquid in its pure form and is commonly used as a disinfectant, bleaching agent, and oxidizer. Hydrogen peroxide is also naturally produced in the human body in small amounts and plays a role in immune defense.
Hydrogen peroxide’s CAS number allows scientists, manufacturers, researchers, and regulators to unambiguously refer to this substance in chemical databases, safety documents, shipping regulations, and scientific research. This is especially important because hydrogen peroxide can exist in different concentrations and be used for various purposes—ranging from low concentrations (3–6%) in household antiseptics to high concentrations (up to 90%) in industrial or rocket propulsion contexts.
Moreover, substances like hydrogen peroxide may have multiple names depending on the context, such as:
- Hydrogen dioxide
- Perhydrol (concentrated solution)
- H₂O₂ (chemical formula)
The CAS number avoids confusion between these terms by providing a single, standardized reference point.
Finally, having a CAS number helps ensure chemical safety. For instance, when handling hydrogen peroxide, the Material Safety Data Sheet (MSDS) and regulatory documents will cite CAS 7722-84-1, which provides essential information on storage, handling, and emergency procedures.
In summary, 7722-84-1 is the universally recognized CAS number for hydrogen peroxide, serving as a crucial identifier in scientific, industrial, and regulatory contexts.
