Bleaching powder

Bleaching Powder

Bleaching powder, also known as calcium hypochlorite or chlorinated lime, is a white, powdery substance with the chemical formula Ca(ClO)2. It is widely used as a disinfectant and a bleaching agent.

History

The production of bleaching powder was first patented by Charles Tennant in 1799, in the industrial city of Glasgow, Scotland. Tennant's method, known as the Tennant's lime process, involved the reaction of chlorine gas with dry slaked lime.

Production

Bleaching powder is produced by the action of chlorine on dry slaked lime [Ca(OH)2]. This reaction can be represented by the following chemical equation:

Ca(OH)2 + Cl2 → Ca(ClO)2 + H2O

The resulting product is a strong oxidizing agent due to the presence of active chlorine.

Uses

Bleaching powder is primarily used for water treatment, especially in swimming pools and drinking water. It is also used in the bleaching of wood pulp in the paper industry, and in the textile industry to bleach cotton and linen. In addition, it is used as a disinfectant in sanitation and healthcare facilities.

Safety

Bleaching powder is a strong oxidizer and can react explosively with combustible materials. It should be stored in a cool, dry place away from heat and open flames. Direct contact with the skin or eyes can cause burns, and inhalation can cause respiratory irritation.

See also

• Chlorine
• Disinfection
• Water treatment