Q31 of 270 Page 97

What is washing soda? State two properties and two uses of washing soda.

Washing soda is sodium carbonate decahydrate. It can be obtained by recrystallisation of sodium carbonate.

Na2CO3 + 10 H2O → Na2CO3.10 H2O


Two properties- (i) It is basic in nature. (ii) It is soluble in nature.


Uses - (i) Sodium carbonate (washing soda) is used in glass, soap and paper industries. (ii) Sodium carbonate can be used as a cleaning agent for domestic purposes. (iii) It is used for removing permanent hardness of water.


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29

Fill in the following blanks:

(a) Common salt is obtained from sea-water by the process of ...............:


(b) Rock salt is mined just like. ......................


(c) Chemical formula of washing soda is................


(d) Sodium hydrogen carbonate is.................soda whereas sodium carbonate is.......soda.


(e) The chemical formula of plaster of Paris is..............

 30

Complete and balance the following chemical equations:

 34

What is baking soda? Write the chemical name of baking soda. Give the important uses of baking soda.

How does baking soda differ chemically from washing soda?

 35

Describe how sodium hydrogen carbonate (baking soda) is produced on a large scale. Write equation of the reaction involved.