Question

What role does sodium hydrogen carbonate plays in-
(a) Cakes and bread
(b) Antacid tablets
(c)Fire extinguisher

Answer 1

Answer:

Fire extinguishers.It is because it has two containers one with sulphuric acid and one with sodium bicarbonate.They react and extinguish the fire by cutting of supply of oxygen

Answer 2

a) In cakes and bread NaHCO3 on being heated during baking decomposes into Na2CO3 ,CO2 and H2O making the cake fluffy due to CO2 and moist due to Water.
b) NaHCO3 is basic and neutralises the acidic nature present in stomach due to presence of HCl.
c)In fire extinguishers it reacts with H2SO4 to release CO2 which being heavier than air cuts off the O2 supply thus extinguishing the fire