How is Sodium Hydrogencarbonate (Baking Soda), NaHCO3 prepared ?

How is Sodium Hydrogencarbonate (Baking Soda), NaHCO3 prepared ? 
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Sodium hydrogencarbonate is known as baking soda because it decomposes on heating to generate bubbles of carbon dioxide (leaving holes in cakes or pastries and making them light and fluffy).

Preparation--Sodium hydrogencarbonate is made by saturating a solution of sodium carbonate with carbon dioxide. The white crystalline powder of sodium hydrogencarbonate, being less soluble, gets separated out. 

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