Q. 175.0( 1 Vote )

The formula of soda ash is
A. Na2CO3 .10H2O

B. Na2CO3.2H2O

C. Na2CO3.H2O

D. Na2CO3

Answer :

Soda ash is formed when sodium carbonate decahydrate, washing soda, is heated above 373K. This causes Na2CO3.10H2O to lose all water of crystallisation to form anhydrous sodium carbonate or soda ash. The correct answer is (iv).

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