Can sodium metal be extinguished with water or foam fire extinguishers when it catches fire? Why? S

Bubble fire extinguishers cannot be used.

extinguishing fires, because the main ingredient of bubble fire extinguishers is carbon dioxide.

Sodium metal. Sodium peroxide is formed when ignited: 2Na + O2 = Na2O2, and the resulting sodium peroxide reacts with carbon dioxide:

2 Na2O2 + 2 CO2 = 2 Na2CO3 + O2 This reaction releases oxygen, which further promotes the reaction of metal nano, so carbon dioxide not only can not extinguish the fire, but burns sodium However, if you use water, sodium and water react to form hydrogen, which will cause great danger to combustion Thank you, welcome to ask! ～～

No! Because sodium can react with water or carbon dioxide in foam fire extinguishers, the reaction equation is as follows: 2Na + 2H2O = = 2NaOH + H2 (G) 4Na + 3CO2 = = 2Na2CO3 + C (the reaction needs to be carried out at high temperatures) Especially the reaction between sodium and water is very violent, and hydrogen is released, which is very easy to occur in the fire field**, so it cannot be extinguished with water or foam fire extinguishers.

In the event of a sodium metal fire, it can be extinguished with fire-fighting sand, graphite powder, sodium carbonate dry powder, calcium carbonate dry powder or a metal sodium fire extinguisher specially used for sodium metal fire extinguishing.

No, it can react with water or carbon dioxide, and the composition of a foam fire extinguisher is carbon dioxide, which emits a lot of heat in the reaction, which is dangerous!

Foam fire extinguishers contain water, and sodium is chemically active, which can react violently with water to produce hydrogen, which is very easy to cause**. Therefore, sodium fires should be extinguished with sand, which is non-flammable and can isolate sodium metal from the air and play a role in extinguishing fires.

The foam fire extinguisher contains a mixed solution of sodium bicarbonate and foaming agent, and a glass bottle liner contains an aqueous solution of aluminum sulfate. When the cylinder body is turned upside down, the two solutions of sodium bicarbonate and aluminum sulfate are mixed and chemically reacted to produce carbon dioxide gas foam.

Due to the small specific gravity of the foam, it can cover the surface of flammable liquids, on the one hand, it reduces the temperature of the liquid surface (endothermy) and reduces the evaporation rate of the liquid; On the other hand, an isolation layer is formed to prevent oxygen from coming into contact with the liquid surface, and the fire is extinguished.

Foam fire extinguishers can be used to extinguish Class A fires, such as fires caused by the burning of solid substances such as wood and cotton; It is most suitable for fighting Class B fires, such as gasoline, diesel and other liquid fires; It cannot extinguish fires of water-soluble flammable and flammable liquids (such as alcohols, esters, ethers, ketones and other substances) and Class E (electrified) fires.

Sodium reacts with oxygen to form sodium peroxide when burning, and sodium peroxide will react with CO2 in foam fire extinguishing agent to form oxygen combustion, 2Na2O2+2

co2=2na2co3+o2

This reaction releases oxygen, which promotes the reaction of metal nano, making the flame more intense and can be extinguished with sand.

The fire extinguishing principle of the foam fire extinguisher is that aluminum sulfate and sodium bicarbonate react to produce aluminum hydroxide precipitation, carbon dioxide, and aluminum hydroxide may further decompose to produce alumina and water, which can not be used for light metal fire extinguishing.

The main extinguishing principle of foam fire extinguishers is water and carbon dioxide.

The sodium and combustion product Na2O2 can react with water and carbon dioxide, so it cannot be extinguished with a foam fire extinguisher.

No, because the gas coming out of the foam fire extinguisher has both water and carbon dioxide.

Foam fire extinguishing agent cannot, sodium reacts with oxygen to form sodium peroxide when burning, sodium peroxide will react with CO2 in foam fire extinguishing agent to generate oxygen to support combustion, 2 Na2O2 + 2 CO2 = 2 Na2CO3 + O2 This reaction releases oxygen, promotes the reaction of metal na, and makes the flame more intense Can be extinguished with sand.

The foam fire extinguisher contains quiet seepage water, and the chemical properties of sodium are very active, which can react violently with water to produce hydrogen, which can easily lead to **. Therefore, sodium fire should be extinguished with sand, which is non-flammable and can isolate the metal sodium in the air and play a role in extinguishing the fire.

The foam fire extinguisher was filled with a mixed solution of sodium bicarbonate and blowing agent, and the other glass bottle liner was filled with an aqueous solution of aluminum sulfate. In general use, the cylinder is turned upside down, and the chemical reaction occurs after the two solutions of sodium bicarbonate and aluminum sulfate are mixed, resulting in carbon dioxide gas foam.

Due to the small specific gravity of the foam, it can cover the surface of the flammable liquid, on the one hand, reduce the surface temperature of the liquid (endothermy) and reduce the evaporation rate of the liquid; On the other hand, an isolation layer is formed to block the contact between oxygen and the liquid level and extinguish the fire.

Foam fire extinguishers can be used to extinguish Class A fires, such as fires caused by the burning of solid substances such as wood and cotton; It is most suitable for extinguishing Class B fires, such as gasoline, diesel and other liquid fires. Water-soluble, flammable, flammable liquids (such as alcohols, esters, ethers, ketones, etc.) fires and Class E (electrified) fires cannot be extinguished. Qi Li.

Fire extinguishing: graphite powder, sodium carbonate dry powder, calcium carbonate dry powder.

It is forbidden to extinguish water and halogenated hydrocarbons.

Graphite powdery soft, blackish-gray; Under the condition of oxygen isolation, its melting point is above 3000, and it is one of the most temperature-resistant minerals. The chemical properties of graphite powder are relatively stable at room temperature, and it is insoluble in water, dilute acid, dilute alkali and organic solvents; The material has high temperature resistance and conductive properties, and can be used as refractory materials, conductive materials, and wear-resistant lubricating materials.

The chemical properties of sodium are very active, and when heated at room temperature and heated, they are combined with oxygen, and react violently with water, and occur when the amount is large**. Therefore, it cannot be extinguished with water, sodium can also be burned in carbon dioxide, react with low-element alcohols to produce hydrogen, and react with liquid ammonia, which has a weak ionization ability.

No.

The fire extinguishing principle of foam fire extinguisher is that aluminum sulfate and sodium bicarbonate react to produce aluminum hydroxide precipitation and carbon dioxide. The main ingredient of bubble fire extinguishers is carbon dioxide. When sodium metal ignites, there is an overlease of sodium oxide to form 2NaO2=Na2O2, and the resulting sodium peroxide reacts with carbon dioxide locally

2Na2O22CO2=2Na2CO3O2 This reaction releases oxygen, and the wax bond promotes the metal-sodium reaction even more. So sodium cannot be extinguished with a foam fire extinguisher.

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When it comes to fire extinguishers, I believe everyone is familiar with them and can often be seen in shopping malls, residential areas and hotels. However, there are many types of fire extinguishers, and many people don't know much about their use, so why can't foam fire extinguishers be used when sodium ignites? How do you use different fire extinguishers?

With these two questions in mind, let's take a look! Why can't foam fire extinguishers be used when sodium is on fire: Because foam fire extinguishers are mainly composed of water and carbon dioxide, and sodium is easy to react with carbon dioxide in foam fire extinguishers when burning, becoming an accelerant and making the flame more intense.

Therefore, small amounts of sodium can be extinguished with sand or a dry powder fire extinguisher. What is the use of different fire extinguishers: 1. Dry powder fire extinguisher Dry powder fire extinguisher is mainly used to extinguish fires such as oil, combustible gas, electrical equipment, etc., take off the fire extinguisher when using, hold the pressure handle in the right hand, and hold the bottom of the bottle in the left hand.

2. Foam fire extinguisher Foam fire extinguisher is mainly used to extinguish the fire caused by oil or general substances, arrive at the fire scene, cover the nozzle with the right hand, put the left hand on the side of the cylinder, make the fire extinguisher a vertical angle, and then shake the fire extinguisher, let go of the nozzle, and spray at a distance of 8 meters from the fire source. However, pay attention to the fire extinguisher, which should be placed horizontally on the ground with the nozzle facing downwards after extinguishing the fire. 3. Carbon dioxide fire extinguisher Carbon dioxide fire extinguisher is mainly used for fire extinguishing of precision instruments and equipment, when used, the right hand holds the pressure handle to the fire site, dismantles the lead and the safety pin, and then stands two meters away from the fire source, and the right hand presses the pressure handle to continuously push forward to extinguish.

Summary: The above is to introduce to you why you can't use foam fire extinguishers when sodium is on fire and what are the relevant contents of how to use different fire extinguishers, I hope to help friends in need.

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Foam fire extinguishers emit substances such as water and carbon dioxide, while sodium and combustion products na o can react with water and carbon dioxide, and the chemical equation is as follows (for example).

2na+2h₂o = 2naoh + h₂↑

The hydrogen gas generated can be burned, and the oxygen produced can be combusted, so it cannot be extinguished with a foam fire extinguisher.

Sodium metal is very reactive, and foam fire extinguishers themselves do not have water, but the reaction produces water and carbon dioxide. Water and sodium react violently. So you can't extinguish the fire with a foam fire extinguisher.

Because conventional (including foam fire extinguishers) fire extinguishers are mainly composed of CO2, it generally does not support combustion, but for active metals such as sodium, it becomes an accelerant.

4Na + CO2 ignition = 2Na2O+c I used to ignite magnesium that is less active than sodium and passed it into CO2 gas, and as a result, magnesium ** So sodium with a foam fire extinguisher will only add fuel to the fire.

Sodium reacts with H2O in the foam.

The CO2 in Ba is selected to react with NA.

c. The dry powder fire extinguisher is filled with ammonium phosphate dry powder fire extinguishing agent. It is mainly used to extinguish flammable liquids such as petroleum and organic solvents, combustible gases and electrical equipment. The dry powder is sprayed using CO2 as the driving force.

dWhen using a foam fire extinguisher to extinguish a fire, a large amount of carbon dioxide and foam can be sprayed, and the part containing water is ejected

2na2o2+2co2=2na2co3+o2↑2na2o2+2h2o=4naoh+o2↑

Dry powder fire extinguishing agents are generally divided into two categories: BC dry powder fire extinguishing agent (sodium bicarbonate) and ABC dry powder (phosphate amine). Foam fire extinguishers are carbon dioxide.