(II) Preparing a soda-acid fire extinguisher The reaction of acids with metal hydrogencarbonates is used in the fire extinguishers which produce carbon dioxide. 1.Take 20 mL of sodium hydrogencarbonate (NaHCO) solution in a wash-bottle. 2.Suspend an ignition tube containing dilute sulphuric acid in the wash-bottle (Fig. 2.10).3. Close the mouth of the wash-bottle. 4.Tilt the wash-bottle so that the acid from the ignition tube mixes with the sodium hydrogencarbonate solution below. 5.You will notice discharge coming out of the nozzle. 6.Direct this discharge on a burning candle. What happens?
pg-36 ncert class 10 science
Answers
Answer:
The burning candle will get extinguished.
Explanation:
In the reaction between NaHCO3 and H2SO4, CO2 is released. CO2 has the ability to extinguish a candle, as it is an non-flammable gas. CO2 pushes the oxygen away from the flame, so oxygen supply will stop and thus, burning candle gets extinguished (Note that it does not put off with a pop sound , like Hydrogen)
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Answer:
Soda acid type extinguisher acts by cutting off supply of air. It acts on all types of fire except due to electrical and inflammable liquids. 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).
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 into 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.