Hypochlorous acid

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Hypochlorous acid (HClO) is a weak acid that forms when chlorine dissolves in water. It is an oxidizer and is used as a disinfectant. Hypochlorous acid is the active ingredient in bleach and is also produced by the human immune system to kill pathogens.

Chemical Properties

Hypochlorous acid has the chemical formula HClO and a molar mass of 52.46 g/mol. It is a colorless aqueous solution that is miscible with water. As a weak acid, it partially dissociates in water to form the hypochlorite ion (ClO⁻) and a hydrogen ion (H⁺).

Production

Hypochlorous acid is produced by dissolving chlorine gas (Cl₂) in water: <math>Cl_2 + H_2O \rightarrow HClO + HCl</math>

It can also be produced by the reaction of sodium hypochlorite (NaOCl) with a weak acid, such as acetic acid: <math>NaOCl + CH_3COOH \rightarrow HClO + CH_3COONa</math>

Uses

Hypochlorous acid is widely used for its disinfectant properties. It is effective against a broad range of microorganisms, including bacteria, viruses, and fungi. It is used in various applications, including:

• Water treatment: Used to disinfect drinking water and swimming pools.
• Healthcare: Used for wound care and as a disinfectant in hospitals.
• Food industry: Used to sanitize food preparation surfaces and equipment.

Biological Role

In the human body, hypochlorous acid is produced by neutrophils, a type of white blood cell, during the immune response. It plays a crucial role in the destruction of pathogens through a process known as the respiratory burst.

Safety and Handling

Hypochlorous acid is a corrosive substance and an oxidizer. It should be handled with care, using appropriate personal protective equipment (PPE). It can cause irritation to the skin, eyes, and respiratory tract.

See Also

• Chlorine
• Bleach
• Disinfectant
• Hypochlorite
• Sodium hypochlorite

References

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