What is the formula of soda ash?
A) $N a_{2} C O_{3} .10 H_{2} O$
B) $N a_{2} C O_{3} .2 H_{2} O$
C) $N a_{2} C O_{3} . H_{2} O$
D) $N a_{2} C O_{3}$

Answer

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Hint: The other names of soda ash are washing soda, soda crystals and sodium carbonate. Soda ash is the inorganic compound which is used as a cleansing agent in the house for domestic purposes. It is the component of many dry soap powders.

Complete answer:
Soda ash is the inorganic compound which is also known as sodium carbonate or washing soda. From the name, sodium carbonate we can conclude that the chemical formula of sodium carbonate will be

N a_{2} C O_{3}

. All forms are white, water-soluble salts that yield moderately alkaline solutions in water. Historically it had been extracted from the ashes of plants growing in sodium-rich soils. Because the ashes of those sodium-rich plants were noticeably different from ashes of wood (once wanting to produce potash), washing soda became referred to as "soda ash." it's produced in large quantities from common salt and limestone by the Solvay process.
Some of the uses of the soda ash or sodium carbonate are –
Sodium carbonate (or washing soda) is employed as a cleanser for domestic purposes like washing clothes. washing soda may be a component of the many dry soap powders.
It is utilized in the manufacture of glass, soap and paper.
It is utilized in the manufacture of sodium compounds like borax.
Temporary and permanent hardness can also be removed by using the soda ash.

The formula of soda ash is $N a_{2} C O_{3}$ . Hence, the correct option is (D).

Note: Sodium carbonate can be obtained as three hydrates:
-Natron or sodium carbonate decahydrate
-Sodium carbonate heptahydrate
-sodium carbonate heptahydrate
-Anhydrous sodium carbonate or calcined soda