Preparing a soda-acid fire extinguisher
The reaction of acids with metal hydrogencarbonates is used in the fire extinguishers which produce carbon dioxide.
Take 20 mL of sodium hydrogencarbonate (NaHCO3) solution in a wash-bottle.
Suspend an ignition tube containing dilute sulphuric acid in the wash-bottle (Fig. 10).
Close the mouth of the wash-bottle.
Tilt the wash-bottle so that the acid from the ignition tube mixes with the sodium hydrogencarbonate solution below.
You will notice an effervescence coming out of the nozzle.
Direct this gas on a burning candle. What happens?
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Answer:
The candle will get extinguished
Explanation:
The gas that is produced is CO2, which creates a blanket around the flame and cuts off the oxygen supply, thus extinguishing the flame
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