Sodium bicarbonate NaHCO3 (Backing soda):
Sodium hydrogen carbonate or sodium bicarbonate is used in backing cakes pastries etc. It is called so because it decomposes on heating to generate bubbles of carbon dioxide, leaving holes in cakes or pastries and making them light and fluffy. This compound is prepared by saturating a solution of sodium carbonate with carbon dioxide. The white crystalline powder of sodium bicarbonate, being less soluble, precipitated out.
· Primarily used as an ingredient in backing.
· Sodium hydrogen carbonate is a mild antiseptic for skin infections.
· It is also used in fire extinguishers.