Overview
Sodium hypochlorite is an inorganic compound with the formula NaClO. It is commonly encountered as a pale greenish-yellow aqueous solution known as liquid bleach. The compound was first produced in 1789 by Claude Louis Berthollet in his laboratory in Paris, France. As a key industrial chemical, sodium hypochlorite is produced on a large scale worldwide. Its production typically involves the reaction of chlorine gas with sodium hydroxide solution. The commercial product usually contains 10-15% available chlorine, though household bleach typically contains 3-8%.
Physical and Chemical Properties
Sodium hypochlorite is a strong oxidizing agent that readily decomposes to release chlorine gas, especially when heated or in acidic conditions. The solution is alkaline with a pH typically around 11-13. It has a characteristic chlorine-like odor and is unstable when exposed to light or heat. The compound's bleaching and disinfecting properties come from its ability to release hypochlorous acid (HOCl) in water, which is a powerful oxidizer. Sodium hypochlorite solutions gradually lose their strength over time, with decomposition accelerated by heat, light, and certain metal ions.
Main Applications
The primary use of sodium hypochlorite is as a disinfectant and bleaching agent. In water treatment, it serves as an effective biocide against bacteria, viruses, and algae. Municipal water systems commonly use it for drinking water disinfection. In household applications, it's the active ingredient in many bleach products for laundry and surface cleaning. Industrial applications include textile bleaching, food processing equipment sanitation, and swimming pool disinfection. The healthcare sector utilizes it for surface disinfection and medical waste treatment.
Safety and Storage
Sodium hypochlorite requires careful handling due to its corrosive nature and potential to release toxic chlorine gas. Proper PPE including gloves and eye protection should be worn when handling concentrated solutions. Storage areas should be cool (below 25°C/77°F) and protected from sunlight. Special attention must be paid to chemical compatibility during storage. Sodium hypochlorite should never be mixed with acids, ammonia, or other reducing agents as this can produce toxic gases. Containers should be made of materials resistant to oxidation, such as high-density polyethylene or fiberglass-reinforced plastic.
B2B Procurement Guide
When procuring sodium hypochlorite commercially, buyers should specify the required available chlorine content (typically 10-15% for industrial use). Transportation considerations are important due to its classification as a hazardous material. Bulk shipments often require specialized tanker trucks or rail cars with appropriate lining. Quality verification should include testing for active chlorine content and stability. For long-term storage requirements, consider products with added stabilizers. Pricing depends on concentration, quantity, and geographic location, with bulk purchases typically offering significant cost savings. Always verify supplier certifications and compliance with relevant industry standards.
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