Preparation of Bleaching Powder Class 10

Today we will discuss the preparation of bleaching powder for class 10. The topic belongs to Chapter 2 Acids, Bases, and Salts. we will discuss the chemical name and formula of bleaching powder, physical and chemical properties, preparation method, and uses of bleaching powder.

 Preparation of Bleaching Powder 

Let’s dive into the topic

 

         Table of content

1.    BleachingPowder formula

2.    Chemical name of Bleaching Powder

3.    Physical Properties of Bleaching Powder

4.    Preparation method of Bleaching Powder

5.   Chemical properties of Bleaching Powder

6.    Uses of Bleaching Powder

7.    Bleaching Action of Bleaching powder

8.    FAQs

Bleaching Powder Formula

`CaOCl_2` or CaCl(OCl)

Chemical Name of Bleaching Powder

Calcium oxychloride or calcium chloro hypochlorite

Physical Properties of Bleaching Powder

   1.  It is a yellow solid substance with a sharp strong smell.

   2.  It is soluble in cold water.

 

Preparation Method of Bleaching Powder

Dry calcium hydroxide and chlorine gas are used in the preparation of bleaching powder.

 

Bleaching powder is obtained when Chlorine gas is passed over dry slaked lime (calcium hydroxide).

Following is the chemical equation for the preparation of bleaching powder

`Ca(OH)_2 + Cl_2  →CaOCl_2  + H_2O`

Chemical Properties of Bleaching Powder

   1.  Reaction with carbon dioxide - Bleaching powder reacts with atmospheric `CO_2`(when kept open) and releases chlorine gas.

`CaOCl_2 + CO_2 → CaCO_3  + Cl_2`

    2.  Reaction with sulphuric acid – Bleaching powder reacts with dil. `H_2SO_4` forms chlorine gas.

`CaOCl_2 + H_2SO_4 → CaSO_4  + H_2O + Cl_2↑`

   3.  Reaction with HCl - Bleaching powder reacts with dil. HCl forms chlorine gas.

 `CaOCl _2 + 2HCl → CaCl_2  + H_2O + Cl_2↑`

 

Uses of Bleaching Powder

  1.  It is used in laundries to bleach clothes.

  2.  It is used to bleach paper, cotton.

  3.  It is used to disinfect drinking water.

  4.  It is used in manufacturing chloroform.

  5.  It is used as an oxidizing agent in industries.

  6.  It is an antiseptic.

  7.  It is used as a laboratory reagent.

 Bleaching Action of Bleaching Powder

 

The bleaching action of bleaching powder is due to nascent or atomic oxygen.

Chlorine gas which is released from bleaching powder reacts with water and forms nascent oxygen[O] that oxidizes the coloured substance to colourless substance.

So bleaching action of bleaching powder is an oxidation reaction due to the formation of nascent oxygen.

`Cl_2+ H_2O →2HCl + [O]`

Coloured substance + [O] →colourless substance

FAQs

   1.  What are the materials used for the preparation of bleaching powder?

   Ans – Dry slaked lime and chlorine gas

  2.  Which  gas is used in the preparation of bleaching powder?

 Ans – chlorine gas

  3.  What  is the action of sulphuric acid on bleaching powder?

Ans – When bleaching powder is treated with sulphuric acid, chlorine gas is liberated.

  4.  What  is the cause of the bleaching action of bleaching powder?

  Ans- Nascent oxygen causes bleaching action of bleaching powder

   5.  What is the chemical formula of bleaching powder?

Ans  - `CaOCl_2`

    Related Topics

    1. Physical Properties of Metals

    2. Preparation of Baking Soda

3. Preparation of Washing  Soda

4. Preparation of Sodium hydroxide