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What does a soda-acid type of ire exting...

What does a soda-acid type of ire extinguisher contain? How does it work? Explain the working of a soda-acid fire extinguisher with the help of a labelled diagram.

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Construction : It contains sodium bicarbonate solution. The small bottle contains sulphuric acid. This bottle is attached to the knob.

Working : For a chemical reaction to take place, the knob is struck. The bottle breaks and sulphuric acid reacts with sodium bicarbonate liberating large amount of `CO_2` gas with great force.
`underset"Sodium bicarbonate"(2NaHCO_3)+underset"Sulphuric acid"(H_2SO_4)to underset"Sodium sulphate"(Na_2SO_4) + underset"Water"(2H_2O) + underset"Carbon dioxide"(2CO_2)`
It forms a blanket around the fire, cutting off the air supply, due to which the fire gets extinguished.
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