Q37 of 48 Page 15

How will you distinguish between baking powder and washing soda by heating?

Baking soda (NaHCO3) on heating produces carbon dioxide (CO2). Carbon dioxide turns lime water milky. It can also extinguish a burning matchstick.



Whereas heating washing soda (Na2CO3.10H2O) does not produce any such gas and hence there is no effect on lime water or a burning matchstick. The water of crystallisation in washing soda is released due to heating and the salt becomes anhydrous white powder called soda ash.



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