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  Inorganic Chemistry

BLEACHING POWDER :

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Bleaching powder is obtained by the action of chlorine on dry slaked lime (Hasenclever method).

                        313 K
Ca(OH)2 + Cl2 ———> CaOCl + H2O

An aqueous solution of bleaching powder gives tests for Cl– and ClO– ions. On long standing, it undergoes auto-oxidation to form calcium chlorate. However, when heated, in presence of COCl2 , it gives O2

6CaOCl2 ———> 5CaCl2 + Ca (Cl3)2

                 CaCl2

2CaOCl2 ———> 2CaOCl2 + O2

It is used for bleaching cotton, wood pulp etc., as a disinfectant, as a germicide for sterilization of drinking water, in the manufacture of chloroform and for making wood unshrinkable.

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