What does a soda-acid type fire extinguisher contain ? How does it work ? Explain the working of a soda- acid fire extinguisher with the help of a labelled diagram.
Lakhmir Singh Chemistry Class 10
Answers
The soda acid type of fire extinguisher contains the following compounds -
1. Sodium hydrogencarbonate solution.
2. Solution of sulphuric acid.
Working System -
These two solutions are present in the separate systems in the extinguisher. When we press the knob of this fire extinguisher, then both the sodium hydrogencarbonate and sulphuric acid comes in contact with each other. This results in production of carbon dioxide gas which stops the burning of an object and thus the fire gets extinguished.
There are three parts in a soda acid type fire extinguisher :-
(1) Container
(2) Bottle
(3) Knob.
The container of a fire extinguisher is in a cylindrical shape.
It contains sodium bicarbonate.
The bottle of the fire extinguisher contains concentrated sulfuric acid. It is attached to a knob.
Knob is struck for the chemical reaction to take place.
The bottle breaks and sulfuric acid reacts with sodium bicarbonate.
Due to this reaction, carbon-dioxide is produced.
It forms a blanket around the fire, cutting off the air supply, due to which the fire gets extinguished.