Operating Principle of the Fire Extinguisher
- lowering the combustible material's temperature below the ignition point.
- cutting off the flow of air.
- shutting off the air supply while simultaneously cooling the flammable substance
- When the fire extinguisher is used, sulphuric acid and sodium bicarbonate solution combine to produce a small amount of carbon dioxide gas.
- The fire extinguisher contains sulfuric acid in a separate bottle and a solution of sodium bicarbonate in water.
- The gas carbon dioxide neither supports nor is it combustible.
- Because it is heavier than air, it snuffs out the oxygen in the air, putting out the flames.
Which one of the following is used in soda-acid fire extinguishers? (a)Sodium chloride (b)Sodium hydrogen carbonate (c)Calcium hydroxide (d)Acetic acid
In soda-acid fire extinguishers, sodium hydrogen carbonate is employed. The following reaction takes place 2NaHCO3 + H2SO4 →Na2SO4 + 2H2O+2CO2.