Science, asked by chandralekha1, 1 year ago

explain how a soda acid type fire extinguisher works

Answers

Answered by sidsr
243
The principle of working of fire extinguisher is based on either of the following three 
conditions: 
• cooling the combustible material below its ignition temperature, or 
• cutting off the supply of air, or 
• cooling the combustible material and at the same time cutting the supply of air. 

Baking soda sulphuric acid ...extinguisher (soda acid) .... Acts by Cuts off supply of air..on All types of fire except due to electrical and inflammable liquids 

The most common fire extinguisher is soda acid. 
The carbon dioxide is liberated by the action of acid on baking soda. It increases the percentage of carbon dioxide in air (CO2 is non supporter of combustion). 

How does this happen......? 

This type of fire extinguisher contains a bottle of sulphuric acid supported by a metallic container 
filled with a baking soda solution.When the cylinder is inverted and knob struck, against the 
ground, the acid bottle breaks and the acid comes in the contact with the backing soda. 

2NaHCO3 + H2SO4--------> Na2SO4 + 2H2O + 2CO2 
baking sulphuric sodium water carbon 
soda acid sulphate dioxide 

As a result carbon dioxide is liberated. This increases the percentage of carbon dioxide in air. Due to this the supply of air is cut off and there, fire is extinguished. These types of extinguishers are used in cinema halls, multistorey buildings, etc. 

http://wanttoknowit.com/who-invented-the... 
http://www.enotes.com/how-products-encyc...
http://chemistry.helium.com/how-to/9931-... 

The person who invented the first 'soda-acid' fire extinguisher was Francois Carlier, who patented his invention in France in 1866. The principle behind this type of portable extinguisher was tartaric acid mixed with a solution of sodium bicarbonate, which produced carbon dioxide to act as a propellant gas. 

The first soda-acid fire extinguisher invented in the US was patented by Almon Granger in 1881. The sodium bicarbonate in Granger's extinguisher was mixed with concentrated sulphuric acid to cause the production of carbon dioxide, which in turn forced out a jet of water. 

The principle mechanism with this type of fire extinguisher was that the acid was contained in a small vial, and there would be a system by which the acid would be released into the soda solution, causing the chemical reaction that created carbon dioxide gas. The gas then pressurised the water, forcing it out of the container through a nozzle or hose. The method used to actually release the acid would either involve a mechanism to break the vial or to release a stopper at one end of the vial. This would be by means of a plunger or lever of some sort.




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Answered by pchandralekha12
221
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 sulphuric acid.it is attached to a knob.
knob is struck for the chemical reaction to take place.
the bottle breaks and sulphuric 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.

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