how does baking soda help in extinguishing fire
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Baking soda, (sodium bicarbonate) is used in class C fire extinguishers. When sodium bicarbonate (baking soda) is heated by the fire it becomes sodium carbonate. ... The carbon dioxide starves the fire of oxygen smothering the fire and the water that is released cools the heat source.
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A fire extinguisher contains sodium bicarbonate powder (baking soda).
It consists of a strong iron vessel with a side discharge vessel nozzle. The iron vessel is filled with sodium bicarbonate solution.
A small glass bottle filled with sulphuric acid is supported inside the iron vessel. A knob is fixed just above this bottle.
On striking the knob, the acid bottle breaks open into the sodium bicarbonate solution.
The sulphuric acid reacts with sodium bicarbonate to form sodium sulphate, water and carbon dioxide