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2nd Year Chemistry Notes Chemistry Notes OF 2ND year Free download & Read, class xII notes HSC notes of chemistry


Bleaching Powder (Short Note)

2nd Year Chemistry Notes


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Old 03-18-2010, 09:46 AM   #1 (permalink)
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Default Bleaching Powder (Short Note)


Bleaching Powder (Short Note)

Definition

Bleaching powder is a white amorphous powder with smell of chlorine.


Formula of Bleaching Powder

On the basis of available percentage of chlorine, the formula of bleaching powder was suggested by Professor Odling. The formula is given by
Ca(OCl)Cl or CaOCl2


Preparation of Bleaching Powder

Bleaching powder is prepared on the large scale by Hasen Clever Process. The plant consist of a number of iron cylinders in which chlorine is brought in contact with slaked lime [Ca (OH)2].
Ca(OH)2 + Cl2 ----> CaOCl2 + H2O


Chemical Reactions of Bleaching Powder

1. In aqueous solution bleaching powder liberates chlorine.
CaOCl2 + H2O ----> Ca(OH)2 + Cl2

2. It reacts with acids to set free chlorine.
CaOCl2 + 2HCl ----> CaCl2 + H2O + Cl2

3. It reacts with atmospheric CO2 and moisture to give following reaction.
2CaOCl2 + CO2 + H2O ----> CaCO3 + CaCl2 + 2HOCl


Uses of Bleaching Powder

1. It is used for sterilization of drinking water.
2. It is used for bleaching of cotton, linen and paper pulp.
3. It is used for the preparation of Cl2 gas and chloroform (CHCl3).

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