Sodium bicarbonate +Sulphuric acid [when reacted ]= Sodium sulphate +Water +Carbon dioxide .

Reaction in Soda Fire Extinguisher




Soda fire extinguishers, also known as soda-acid fire extinguishers, are a type of fire extinguisher that uses a chemical reaction between baking soda (sodium bicarbonate) and sulfuric acid to extinguish fires. This type of fire extinguisher is commonly used in industrial settings and is effective for combating Class B and Class C fires involving flammable liquids and electrical equipment.




How does it work?

The reaction that occurs in a soda fire extinguisher is a simple acid-base reaction. The extinguisher consists of two separate chambers or containers, one containing baking soda and the other containing sulfuric acid. When the extinguisher is activated, it releases the sulfuric acid into the baking soda solution, causing a chemical reaction to take place.




The Chemical Reaction:

The chemical reaction between baking soda (sodium bicarbonate) and sulfuric acid can be represented by the following equation:

NaHCO3 + H2SO4 → Na2SO4 + H2O + CO2

In this reaction, the sulfuric acid (H2SO4) reacts with the sodium bicarbonate (NaHCO3) to form sodium sulfate (Na2SO4), water (H2O), and carbon dioxide (CO2). The carbon dioxide is produced as a gas, which helps to displace the oxygen around the fire, effectively smothering it.




Fire Extinguishing Mechanism:

When the sulfuric acid is released into the baking soda solution, the reaction produces a large amount of carbon dioxide gas. The gas is released as bubbles, creating a frothy foam. This foam acts as a blanket, covering the surface of the fire and preventing the supply of oxygen, which is essential for combustion. By depriving the fire of oxygen, the soda fire extinguisher effectively extinguishes the flames.




Advantages and Limitations:

- Soda fire extinguishers are effective for Class B and Class C fires, making them suitable for flammable liquid and electrical equipment fires.
- They are non-toxic and do not leave behind any residue after use.
- Soda fire extinguishers are relatively inexpensive compared to other types of fire extinguishers.
- However, they have limitations, such as a limited range and effectiveness on Class A fires (fires involving ordinary combustible materials like wood and paper).
- Additionally, the reaction between baking soda and sulfuric acid can be corrosive if not properly cleaned after use.




In conclusion, soda fire extinguishers utilize a chemical reaction between baking soda and sulfuric acid to produce carbon dioxide gas, which displaces the oxygen and extinguishes the fire. They are effective for Class B and Class C fires and have advantages such as being non-toxic and leaving no residue. However, they have limitations and should be used with caution, following proper safety protocols.