Whether aluminum and sulfuric acid produce harmful gases

Aluminum and sulfuric acid do not produce harmful gases, and in the case of dilute sulfuric acid, hydrogen is generated;

If it is concentrated sulfuric acid, then passivation will occur, and no harmful gas will be produced.

Aluminum: Silvery-white light metal. Malleable.

Products are often made in sticks, sheets, foils, powders, bands, and filaments. In humid air, it can form an oxide film to prevent metal corrosion. When heated in the air, the aluminium powder burns violently and emits a dazzling white flame.

Soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solutions, insoluble in water. Relative density. Melting point 660 .

Boiling point 2327. The content of aluminum in the earth's crust is the third most abundant metal element in the earth's crust after oxygen and silicon. The development of the three important industries of aviation, construction and automobile requires the unique properties of aluminum and its alloys, which greatly facilitates the production and application of this new metal aluminum.

It is extremely versatile.

Primary Uses: The use of a substance depends largely on the nature of the substance. Because of its many excellent properties, aluminum has a wide range of applications.

Aluminium and aluminium alloys are one of the most versatile and economical materials available today. Since 1956, the world's aluminum production has surpassed copper production and has been the largest non-ferrous metal. At present, aluminum is the second largest metal for human applications after steel in terms of production and usage (in tons); Moreover, the resources of aluminum are very abundant, according to preliminary calculations, the mineral reserves of aluminum account for more than 8% of the earth's crustal constituent materials.

Aluminum accumulates slowly in the human body, and the toxicity it causes is slow and imperceptible, however, once a toxic reaction of metabolic disorders occurs, the consequences are very serious. Therefore, attention must be paid to prevent the absorption of aluminum in daily life and reduce the use of aluminum products. The harm of aluminum and its compounds to human beings cannot be compared with its contribution, as long as people pay real attention to it and avoid weaknesses, it will play a more important role in human society.

How to avoid it: Avoid using cooking utensils made of aluminum;

Eat less fried fritters, candies and other foods packaged in aluminum, and drink less canned soft drinks;

Some medicines are made of aluminum-containing substances, and the use of aluminium-containing drugs such as Al(OH)3, which can neutralize stomach acid, should be reduced.

No, the reaction of aluminum and sulfuric acid produces hydrogen, which is harmless.

Aluminum and sulfuric acid are chemically reactive. The equation for the chemical reaction of aluminum with dilute sulfuric acid is as follows:

2al+3h2so4=al2（so4）3+3h2↑The equation for the chemical reaction of aluminum with concentrated sulfuric acid is as follows:Passivation at room temperature: 2Al+3H2SO4 (concentrated) = Al2O3+3SO2 +3H2O

Heating reaction: 2AL+6H2SO4 (concentrated) = AL2(SO4)3+3SO2 +6H2O (condition: heating).

Aluminum and concentrated sulfuric acid do not react.

At the beginning of the reaction, the sulfuric acid oxidizes the aluminum, causing an oxide film to form on the surface of the aluminum, preventing the reaction. The rate decreases. As the reaction progresses, the sulfuric acid thins and the sulfuric acid dissolves the oxide film.

And because aluminum reacts with sulfuric acid to heat up, the solution heats up, so the rate increases. As the reaction progresses, the sulfuric acid becomes thinner, and the decreasing concentration of reactants predominates, so the rate decreases again. That's my opinion.

Precautions

Leak handling. Quickly evacuate the personnel in the leakage contaminated area to a safe area, isolate them, and strictly restrict access to them. It is recommended that emergency responders wear self-contained positive pressure respirators and anti-acid and alkali overalls.

Do not come into direct contact with spills. Cut off the source of the leak as much as possible. Prevent the flow into restricted spaces such as sewers and drainage ditches.

Small leaks: Mix with sand, dry lime or soda ash. It can also be rinsed with a large amount of water, diluted with washing water and put into the wastewater system.

Massive leakage: Construct embankments or dig pits to contain them. Transfer by pump to a tanker or special collector** or transport to a waste disposal site.

Al2(SO4)3 and 18H2O are aluminum sulfate containing 18 crystalline waters, which are read as aluminum sulfate 18 hydrate, which are chemically stable and are not easy to lose crystal water under the condition of constant temperature;

When heated, the crystal water will be lost to form aluminum sulfate, and the reaction equations Al2(SO4)3, 18H2O(heating) AI2(SO4)3, 18H2O, will be decomposed to form alumina (Al2O3), sulfur trioxide (SO3), sulfur dioxide reaction equation 2Al2(SO4)3 (high temperature) 2Al2O3, 104SO3, and 10SO2

Industrial products are white or slightly grayish powders or bulk crystals that may cause the surface of the product to turn yellow due to the possible presence of a small amount of ferrous sulfate. Aluminium sulphate is one of the earliest flocculants used.

The flocculation process of aluminum sulfate on colloidal particles in water is divided into four areas: adsorption and destabilization, precipitation flocculation, adsorption and precipitation mixing zone and restabilization. Adding an excess of aluminum sulfate? It will form a colloidal re-stabilization and affect the flocculation effect. Aluminum sulfate** is cheap and widely used.

Concrete coagulant is a substance that can play a role in flocculation and coagulation in the coagulation process. Coagulants are mainly used for the purification of drinking water and industrial wastewater, and the treatment of special water quality, such as: oily sewage, printing and dyeing papermaking sewage, smelting sewage, containing radioactive characteristics, containing Pb, CR and other toxic heavy metals and F-containing sewage.

Generally, coagulants are divided into two categories: organic coagulants and inorganic coagulants.

The chemical equation for the reaction of aluminum and dilute sulfuric acid solution is2al+3h2so4=al2(so4)3+3h2↑；Aluminum and concentrated sulfuric acid will undergo passivation reaction: 2AL + 3H2SO4 (concentrated) - Al2O3 + 3SO2 + is a dense oxide film, which will not be able to continue the reaction. Aluminum has no reaction chemical equation and no ionic equation with concentrated sulfuric acid.

Passivation principle:The passivation mechanism can be explained by the thin film theory, that is, it is believed that the passivation of Youzhi is due to the interaction between the metal and the oxidizing substance, and a very thin, dense and covering passivation film can be formed on the metal surface when the degree of collapse is high, and the passivation film can be well and firmly adsorbed on the metal surface. This layer of film exists in an independent phase, usually a compound of oxide metal.

It plays the role of completely separating the metal from the corrosive medium and preventing the metal from coming into contact with the corrosive medium.