SS2 Chemistry Lesson Note on Uses of Halogens and their Compounds

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USES OF HALOGENS AND THEIR COMPOUNDS

1. Fluorine is used in rocket propulsion and in making Uranium(iv) fluoride. It is also used in making fluorocarbon compounds which are used as refrigerant, aerosol propellant, anaesthetics and fire extinguisher and fluids. The flouoro- carbons contain only carbon and fluorine and are extremely inert and also are used as polytetrafluoroethene[PTFE] with the trade name Teflon in making valves, seals, gaskets, electrical insulators among others.
2. CHLORINE: is used as oxidant in the manufacture of bromine and as bleach and germicide in treatment of water. Chlorine is used in production of HCl (hydrogen chloride) in commercial quantity, in the production of fabrics and papers and also insecticides. (e.g DDT)(3) Iodine dissolved in alcohol or potassium iodide [KI] is used as antiseptic for cuts and scratches.
3. HYDROCHLORIC ACID which is one of the most laboratory acid, is used to remove rust from steel sheet before galvanizing.
4. SODIUM OXOCHLORATE (I) [NaCLO] is used as disinfectant and for bleaching in laundries.
5. SODIUM OXOCHLORATE (1) decomposes on warming to sodium oxochlorate(v), NaCLO3 which is used as weed killer.
6. Tetrachloromethane and trichloroethene are degreasing solvents.
7. Polychloroethene is used in making plastics
8. Dettol is used as disinfectant and antiseptics.
9. Dichlorodiphenyltrichloroethane (DDT) and benezehexachloride are used as pesticides
10. Bromine finds application in the manufacture of dyestuffs and in making silver bromide used in photographic materials.

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