Question

Write the formula and two uses of Bleaching powder and washing soda.​

Answer 1

Answer:

(b) Bleaching powder is calcium oxychloride(CaOCl2).

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Refrences.

Washing soda Baking soda

Sodium carbonate or washing soda is made up of sodium and acid. Its formula is Na2CO3. Sodium bicarbonate or baking soda is made up of sodium, acid and hydrogen. Its formula is NaHCO3.

Answer 2

Bleaching Powder :-

We know that chlorine is produced during the electrolysis of aqueous sodium chloride (brine). This chlorine gas is used for the manufacture of bleaching powder. Bleaching powder is produced by the action of chlorine on dry slaked lime $\sf \bigg[Ca(OH) _{2} \bigg]$.

Bleaching powder is represented by formula $\sf CaOCl _{2}$, though the actual composition is quite complex.

$\bf Ca(OH) _{2} +CI _{2} \: ⟶ \: CaOCl_{2}+ H_{2}O$

Uses of Bleaching Powder :

➩ It is used for bleaching cotton and linen in the textile industry for bleaching wood pulp in paper industry and for bleaching washed clothes in laundry.

➩ Used as an oxidizing agent in many chemical industries.

➩ Used for disinfecting drinking water to make it free of germs.

➩ Used as a reagent in the preparation of chloroform.

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Washing soda (sodium carbonate) :-

Another chemical that can be obtained from sodium chloride is $\sf Na_{2}Co_{3}. \: \: 10 \: H _{2}O$(washing soda). You have seen above that sodium carbonate can be obtained by heating baking soda. Recrystallisation of sodium carbonate gives washing soda. It is also a basic salt.

$\bf Na_{2} CO_{3}+10 \: H_{2}0 \: ⟶ \: Na_{2} CO_{3} \: . \: 10 \: H_{2}0$

Sodium carbonate and sodium hydrogen carbonate are useful chemicals for many industrial processes.

Uses of Washing soda :

➪ Sodium carbonate (washing soda) is used in glass, soap and paper industries.

➪ It is used in the manufacture of sodium compounds such as borax.

➪ Sodium carbonate can be used as a cleaning agent for domestic purposes.

➪ It is used for removing permanent hardness of water.

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