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Washing soda

Posted on by Mrs Shilpi Nagpal

Question 1 What is the chemical name and formula of washing soda?

Question 2 What is soda ash?

Question 3 Name a metal compound which has detergent properties?

Question 4 Name a sodium compound used for making borax and glass?

Question 5 Explain the preparation of washing soda by solvay’s process?

Question 6 Give uses of washing soda?

Question 7 Give few properties of washing soda? 

Washing Soda

Washing soda is sodium carbonate containing 10 molecules of water of crystallisation.It is called as sodium carbonate decahydrate.

The formula of washing soda is
washing soda formula class 10
Sodium carbonate which does not contain any water of crystallisation is called anhydrous sodium carbonate or soda ash.The formula is Na2CO3
 

Preparation of Washing Soda

It is prepared by Solvay’s process.
 
(1) A cold and concentrated solution of sodium chloride is reacted with ammonia and carbon dioxide to obtain sodium hydrogen carbonate.
 
(2) Sodium hydrogen carbonate is separated by filtration,dried and heated.Oh heating sodium hydrogen carbonate decomposes to form sodium carbonate.

(3) Anhydrous sodium carbonate is dissolved in water and recrystallised to get washing soda crystals containing 10 molecules of water of crystallisation.

 

solvay process

Properties of Washing Soda

(1) It is a white transparent crystalline solid.
 
(2) It is soluble in water.
 
(3) The solution of washing soda in water is alkaline which turns red litmus to blue.
 
(4) It has cleansing properties.
 

Uses of Washing Soda 

(1) It is used to remove permanent hardness of water.
 
(2) It is used in the manufacture of glass,soap,paper.
 
(3) It is used for washing clothes.
 
(4) It is used in the manufacture of borax.

About Mrs Shilpi Nagpal

Mrs. Shilpi Nagpal is a post-graduate in Chemistry and an experienced tutor who has been teaching students since 2007. She specialises in tutoring science subjects for students in grades 6-12. Mrs. Nagpal has a proven track record of success, and her students have consistently achieved better grades and improved test scores. She is articulate, knowledgeable and her passion for teaching shines through in her work with students.

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