The chemical equation for the reaction of Fe with dilute sulfuric acid

fe+2hcl=fecl2+h2；fe+h2so4=feso4+h2

Fe reacts with dilute sulfuric acid Fe reacts with dilute nitric acid, dilute sulfuric acid.

Iron reacts with dilute nitric acid first, as long as there is H+ and NO3 in the solution—both in the presence of nitric acid, iron can react. It should be noted that because nitric acid has strong oxidation regardless of concentration, it can oxidize iron to positive trivalent, that is, Fe + 4Hno3 (dilute) = Fe (No3) 3 + No + 2H2O, but if there is too much iron, Fe + 2Fe3 + = 3Fe2+ So when there is too much iron, divalent iron is generated, that is, 3Fe + 8Hno3 (dilute) = 3Fe (NO3) 2 + 2No + 4H2O If you are a freshman in high school, I think there is no need to dig so deep in this part of the knowledge in the compulsory course. It is enough to understand that iron reacts with dilute nitric acid first, Fe + 2Fe3 + = 3Fe2+ So when there is an excess of iron, divalent iron is generated, that is, 3Fe + 8Hno3 (dilute) = 3Fe (No3) 2 + 2No + 4H2o If you are a high school freshman. The reaction is sequential, whether it is iron reacting with hydrogen ions or reacting with nitric acid, it is oxidized.

Since nitric acid is more oxidizing than hydrogen ions, it reacts with nitric acid first. There should be both,,(The exam is generally asked about copper, which reacts with nitric acid first).

After the reaction of Fe with dilute sulfuric acid, the mass of the solution increases or decreases. Please analyze Fe+H2SO4=FeSo4+H2 It is easy to analyze from the chemical equation that the mass is increased because the atomic weight of Fe2+ is greater than that of H2. The mass is increased, Fe+H2SO4=FeSO4+H2

If 1molFe is involved in the reaction, the mass can be increased by 56-2=54g

Zeng Da, because 56 parts of Fe replace 2 parts of hydrogen, not to mention that Fe is insoluble in water, while ferrous sulfate is soluble in water. Enlarge.

Why is the solution of Fe reacted with dilute sulfuric acid light green. First of all, FE reacts with dilute sulfuric acid to produce divalent iron ions, and the solution containing divalent iron ions is green shade to determine the specific reason for the concentration of the university.

Iron reacts with dilute nitric acid, and there are two cases:

1. When dilute nitric acid is insufficient, the chemical equation of the reaction between iron and dilute nitric acid is: 3Fe + 8Hno3 = 3Fe(NO3)2 + 2 No + 4H2O, with a gas symbol after NO.

2. When the dilute nitric acid is sufficient, the reaction equation is: Fe + 4Hno3 = Fe(NO3)3 + No + 2H2O, and there is a gas symbol behind NO.

Distinguish between dilute and concentrated nitric acid

1. Add iron or aluminum to cold nitric acid, if there is no obvious phenomenon, it is concentrated nitric acid, and if bubbles are produced on the surface of iron or aluminum, it is dilute nitric acid.

2. Directly looking, the white mist is concentrated nitric acid, and the white mist is dilute nitric acid, which is the use of nitric acid's volatility.

The equation for the reaction of Fe and concentrated sulfuric acid under heating is as follows: 2Fe + 6H2SO4 (concentrated) = Heating = Fe2 (SO4) 3 + 3SO2 + 6H2O.

If the reaction occurs under normal conditions: 3Fe + 4H2SO4 (concentrated) = Fe3O4 + 4SO2 + 4H2O.

Common sense of reaction: Iron and concentrated sulfuric acid will not react at room temperature, and iron and concentrated sulfuric acid will react under heating conditions.

At room temperature, the cold concentrated sulfuric acid can passivate iron, aluminum, etc., and the sulfuric acid molecules react with the iron molecules to form a dense oxide film, preventing the sulfuric acid molecules from continuing to react with the metal. This is a method that restores the surface of the metal into a state that is not easily oxidized and slows down the corrosion rate of the metal. Therefore, iron and concentrated sulfuric acid will not react at room temperature.

Under atmospheric pressure heating, concentrated sulfuric acid can react with all metals (including platinum, gold, iron) except iridium and ruthenium to form ** metal sulfate, which itself is reduced to SO2, S, H2S or metal sulfides.

The chemical equation for the reaction of Fe2O3 and dilute sulfuric acid is: Fe2O3 + 3H2SO4 ==Fe2(SO4)3 + 3H2O. Iron oxide is an inorganic substance with the chemical formula Fe2O3 and is a red or dark red amorphous powder.

The relative density is 5, and the melting point is 1565 (simultaneous decomposition).

Insoluble in water, soluble in hydrochloric acid and sulfuric acid, slightly soluble in nitric acid. Strong hiding and tinting strength, no oil permeability and no water permeability. It is stable in the atmosphere and sunlight, resistant to polluting gases, high temperature and alkali.

The crystalline particles of the dry process products of this product are coarse and hard, and they are suitable for magnetic materials and polishing and grinding materials. Wet products have fine and soft crystalline particles, which are suitable for the coating and ink industry.

Chemical properties of iron oxide and dilute sulfuric acid:

It has the properties of an alkaline oxide and reacts with an acid to form a salt. Dilute sulfuric acid can react with active metals to produce hydrogen gas (Note: Concentrated sulfuric acid will passivate iron, making it unreactive).

Dilute sulfuric acid can react with basic oxides to form salts and water. Dilute sulfuric acid is added to barium chloride solution to form a white precipitate, and dilute hydrochloric acid is added, and the white precipitate does not disappear.

The above content refers to: Encyclopedia - Scientific Chemical Equations.

The above content reference: Encyclopedia - dilute sulfuric acid.

The chemical equation for the reaction of sulfur and concentrated sulfuric acid is 2H2SO4+S=3SO2+2H2O. The phenomenon is the transformation from solid to liquid, and the color changes from dark to brown; At this time, the sulfuric acid and sulfur begin to react, and the reaction becomes more and more violent, releasing a pungent SO2 gas. The reaction process releases heat, stops heating, and the reaction continues.

Sulfur is a non-metallic element with the chemical symbol s and atomic number 16. Sulfur is one of the oxygen group elements and is located in the third period in the periodic table. Elemental sulfur is usually a yellow crystal, also known as sulfur.

There are many kinds of allotropes of sulfur element, including orthorhombic sulfur, monoclinic sulfur and elastic sulfur. The element sulfur is usually found in nature in the form of sulfides, sulfates, or elementals.

Sulfur is insoluble in water, slightly soluble in ethanol, and soluble in carbon disulfide. Sulfur is an important component of proteins in the human body and is of great significance to human life activities. Sulfur is mainly used in the production of fertilizers, gunpowder, lubricants, pesticides and antifungals.

To humans, natural elemental sulfur is non-toxic and harmless, while dilute sulfuric acid, sulfate, sulfurous acid and sulfite are toxic, and sulfides are usually highly toxic. Concentrated sulfuric acid can corrode the human body**.

Concentrated sulfuric acid, commonly known as bad water, is a strong mineral acid with high corrosiveness. Concentrated sulfuric acid refers to a solution of sulfuric acid with a mass fraction greater than or equal to 70%. It is also highly corrosive:

At atmospheric pressure, boiling concentrated sulfuric acid can corrode all metals except iridium and ruthenium (even gold and platinum), and the number of elemental metal species that can corrode even exceeds that of aqua regia. Sulfuric acid has strong oxidizing properties at high concentrations, which is one of the biggest differences it has from dilute sulfuric acid. At the same time, it also has dehydration, difficult volatility, acidity, water absorption, etc.

Concentrated sulfuric acid is very corrosive, if it is accidentally splashed on ** or clothing during the experiment, it should be rinsed with plenty of water immediately.

Iron reacts with dilute nitric acid, and there are two cases:

1.When dilute nitric acid is insufficient, the chemical equation for the reaction of iron and dilute nitric acid is: 3Fe + 8Hno3 = 3Fe(NO3)2 + 2 No + 4H2O, with a gas sign after NO;

2.When the dilute nitric acid is sufficient, the reaction equation is:

Fe + 4Hno3 = Fe(No3)3 + No + 2H2O, with a gas symbol after No.

The chemical equation for the reaction of dilute sulfuric acid with iron oxide is as follows: Fe2O3+ 3H2SO4==Fe2(SO4)3+3H2O. The phenomenon is that the red solid gradually disappears, and the solution changes from colorless to yellow.

Ferric oxide is a reddish-brown powder, dilute sulfuric acid colorless and transparent solution, the reaction phenomenon is that the red solid substance gradually dissolves, and the solution changes from colorless to light yellow. This reaction is a kind of metathesis reaction, which does not change the valence of the valence, and directly exchanges between ions. The reaction produces ferric sulfate and water.

Properties and uses of iron oxide:The chemical formula of iron oxide is Fe2O3, soluble in hydrochloric acid, and is a reddish-brown powder. It is also known as ferric oxide, burnt limonite, burnt ochre, iron dan, iron red, red powder, Venetian red (the main component is iron oxide) and so on.

Its reddish-brown powder is a low-grade pigment, known as iron oxide red in industry, which is generally used in paint, ink, rubber and other industries, and can also be used as a catalyst, a polishing agent for glass and stone metal, and can be used as a raw material for ironmaking.

The above content reference: Encyclopedia - Iron Oxide.

1. The chemical equation for the reaction of iron and dilute sulfuric acid is: Fe + H2SO4 = H2 + FeSO4. Iron and dilute hydrochloric acid react to form ferrous chloride and hydrogen, which is a displacement reaction.

2. Iron is a metal element with atomic number 26 and iron elemental chemical formula: Fe. Pure iron is white or silvery-white with a metallic luster.

Melting point 1538, boiling point 2750, soluble in strong acid and medium strong acid, insoluble in water. Iron has 0 valence, +2 valence, +3 valence and +6 valence, of which +2 and +3 valence are more common, and +6 valence is rare.

3. Iron is easily soluble in dilute inorganic acids to form divalent iron salts and release hydrogen. When encountering concentrated sulfuric acid or concentrated nitric acid at room temperature, a layer of oxide protective film is formed on the surface to "passivate" the iron, so iron products can be used to contain cold concentrated sulfuric acid or cold concentrated nitric acid. When heated, iron can react with concentrated sulfuric acid or concentrated nitric acid to form +3 valence iron salts, along with SO2 or NO2.

4. Iron loses two electrons when it reacts with non-oxidizing acids (hydrochloric acid), sulfuric acid, sulfur, copper sulfate solutions, etc., and becomes +2 valence; When reacting with nitric acid, it depends on the ratio of the amount of the substance and the concentration of nitric acid.