Description

Calcium Hypochlorite ( also called bleaching powder) is a white crystalline solid, decomposes at **0 C, decomposes  in water and alcohol, not hygroscopic, practically clear in water solution. It is produced by passing chlorine gas over slaked lime; 3Cl2 + 2NaOH + 2Ca(OH)2 = Ca(ClO)2 + CaCl2+ 2NaCl + 2H2O (sodium process) or 2Cl2 + 2Ca(OH)2 = Ca(ClO)2 + CaCl2*2H2O (calcium process). Chlorine is a general biocide substance killing germs, micro-organisms, algae, etc. The most widely used chloride chemical disinfectants are chlorine, ozone, chlorine dioxide and chloramine. Hypochlorite is an alternative choline source when chlorine gas is impractical. The commercially available liquid form is sodium hypochlorite (NaOCl). Hypochlorite is the common name for chlorate(I) salt. The related names to the acids are clear when the oxidation number statement is appended; hypochlorite [or chlorate(I)] contains the ion, ClO- ; chlorite [or chlorate(III)], ClO*-; Chlorate [or chlorate(V)], ClO*-; perchlorate [or chlorate(VII)], ClO*-.Hypochlorite solution gradually releases chlorine into water. Hypochlorite anion,ClO-, changes the oxidation-reduction potential of the cell, and resulting in the inactivations of the micro-organism's function. Calcium Hypochlorite quickly forms hypochlorous acid (the killing form of chlorine) in water. It is used in water treatment as a general biocide.  Calcium hypochlorite is used by many paper conservationists to bleach archival papers, and it is used as an oxidizing agent to reduce the effects of foxing. Any hypochlorite of calcium, the normal anhydrous salt (Ca(ClO)2), that is generally found in commercial products contains *0 to *5% available chlorine. It is used as a bleaching agent (paper, textiles), bactericide, deodorant, water Purification, sterilizer, disinfectant for swimming pools, fungicide and in sanitary Installations.