Sodium bicarbonate, also called sodium hydrogen carbonate, or bicarbonate of soda, NaHCO3, is a source of carbon dioxide and so is used as an ingredient in baking powders, in effervescent salts and beverages, and as the main constituent of dry-chemical fire extinguishers. Its slight alkalinity…
Sodium bicarbonate is used in most dry fire extinguishers.Potassium bicarbonate is commonly utilized in industrial applications, as it decomposes at the higher temperatures found in grease and chemical type fires.The essential factor in extinguishing fires is excluding oxygen by the safest and most effective means.
Potassium Bicarbonate as a Fire Extinguisher | Viral Alkalis
Potassium Bicarbonate is used as a Dry chemical powder in fire extinguishing agent for Class B and Class C type fires. Unlike its sodium counterpart, Potassium bicarbonate has much more of industrial application due to its effectiveness in decomposing at higher temperatures (between 212 and 392 °F) – which is prevalent in chemical fires.
Potassium bicarbonate is also used in certain types of fire extinguishers. When such an extinguisher is used, the potassium bicarbonate reacts with an acid present in the device to produce carbon dioxide. The carbon dioxide propels a liquid from the extinguisher and, itself, helps put out a fire.
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Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher