What is a soda acid fire extinguisher?

What is a soda acid fire extinguisher ?

The principle of working of any fire extinguisher is based on either of the following three


• cooling the combustible material below its ignition temperature, or

• cutting off the supply of air, or

• cooling the combustible material and at the same time cutting the supply of air.

Soda acid type extinguisher acts by cutting off supply of air. It acts on all types of fire except due to electrical and inflammable liquids

The carbon dioxide is liberated by the action of acid on baking soda. It increases the percentage of carbon dioxide in air (CO2 is non supporter of combustion).

This type of fire extinguisher contains a bottle of sulphuric acid supported by a metallic container

filled with a baking soda solution.When the cylinder is inverted and knob struck, against the

ground, the acid bottle breaks and the acid comes into contact with the backing soda.

2NaHCO3 + H2SO4-> Na2SO4 + 2H2O + 2CO2

Baking sulphuric sodium water carbon

soda acid sulphate dioxide

As a result carbon dioxide is liberated. This increases the percentage of carbon dioxide in air. Due to this the supply of air is cut off and there, fire is extinguished. These types of extinguishers are used in cinema halls, multistorey buildings, etc.