Archive
9th of September 2015
Chemistry
Q:

what is sodium bicarbonate ?

Shriya Natta - CBSE - Class X

Wednesday, September 09, 2015 at 18:46:PM

A:

Chemical formula: NaHCO3

It is produced on a large scale by treating cold and concentrated solution of sodium chloride (brine) with ammonia and carbon dioxide.

 

NaCl     +     H2O  +  CO2  +  NH3     →    NH4Cl        +         NaHCO3

On heating sodium hydrogen carbonate solution, it decomposes to give sodium carbonate with the evolution of carbon dioxide.

 

2NaHCO3               Na2CO3  + H2O + CO2

Uses:

•Used as an antacid to remove acidity of the stomach.
•Used in making baking powder which is used in making cakes, breads, etc.
•On heating or mixing baking powder  with water, carbon dioxide is evolved  which causes the breads, cakes, etc. to rise, making them soft and spongy.
•     NaHCO3 + H+  → CO2 + H2O + Sodium salt of acid
•Used in soda-acid fire extinguishers.

Wednesday, September 09, 2015 at 18:48:PM