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Anonymous users2024-02-15Oxygen uptake (—)2Fe — 4E- =2Fe2+ (O2+2H2O+4E-=4OH - Hydrogen Evolution (—)Fe —2E- =Fe2+ (2E- +2H+ =H2 (ascending sign) This is definitely the correct answer.
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Anonymous users2024-02-14Oxygen inhalation: Positive electrode: O2 +2H2O+4E- -4OH- negative electrode:
Fe---Fe2+ +2E-Hydrogen Evolution: Positive Electrode: 2H+ +2E- -H2 (Gas) Negative Electrode:
fe---fe2+ +2e- all you need to do is it.
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Anonymous users2024-02-13Oxygen. When there are impurities on the surface of the iron or the iron itself is not pure enough to contain other components, the iron exposed to the air uses air as the electrolyte, and has the conditions for a galvanic battery: two electrodes, the electrolyte and the spontaneous electron transfer.
Iron is a relatively reactive metal, junior high school students also know, 3Fe + 2O2 = Fe2O3 is the equation for the slow oxidation of iron, if there is water, it is 4Fe + 3O2 + 6H2O = 4Fe (OH) 3 The product is red rust. In general, the impurity on the surface of iron is H2O, and if the internal composition of iron is impure, then it is C.
Example with H2O as the positive electrode:
O2- as a medium (in general, air is neutral, the reaction takes place under neutral conditions, so O2- acts as an electrolyte).
Positive reaction: 3O2 + 12E- (electron) = 6O2 - negative reaction: 4Fe-12E-+6O2-+6H2O = 4Fe(OH)3 Total reaction: 4Fe + 3O2 + 6H2O = 4Fe(OH)3
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Anonymous users2024-02-12The chemical equation of oxygen absorption corrosion of iron.
It is: 4Fe + 3O2 + 6H2O = 4Fe (OH)3.
The oxygen corrosion of iron is divided into two steps, the first step is 2Fe + O2 + 2H2O = 2Fe (Oh) 2, Fe (Oh) 2 continues to be oxidized: 4Fe (Oh) 2 + O2 + 2H2O = 4Fe (Oh) 3, the total reaction equation is 4Fe + 3O2 + 6H2O = 4Fe (Oh) 3.
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Anonymous users2024-02-11Equation: Formation of galvanic cells, oxygen corrosion:
Negative Electrode (Fe): 2Fe - 4e = 2Fe Positive Electrode (C): O +4E +4H O = 4OH This is a typical example of galvanic corrosion.
A thin layer of water film will be formed on the surface of steel in humid air, and the water film will dissolve carbon dioxide, sulfur dioxide, hydrogen sulfide, and other gases from the atmosphere, so that the water film contains a certain amount of hydrogen ions, and as a result, a thin film of electrolyte solution is formed on the surface of steel, which forms a galvanic battery with iron and a small amount of carbon in steel.
Because hydrogen is continuously released during the corrosion process, it is called hydrogen evolution corrosion, which is corrosion caused in an acidic environment. If the water film adsorbed on the surface of the steel is very acidic or neutral, but a certain amount of oxygen is dissolved, oxygen absorption corrosion will occur.
Electrochemical corrosion is the formation of two electrodes by metal and electrolyte to form a corrosive galvanic cell. For example, iron and oxygen, because the electrode potential of iron is always lower than that of oxygen, iron is a negative electrode and is subject to corrosion. It is characterized by the formation of many small bulges of varying diameters on the surface where oxygen corrosion occurs, and the secondary layer is a black powdery ulcer corrosion pit.
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Anonymous users2024-02-10Negative electrode: Fe-2e = Fe
Positive electrode: oxygen absorption corrosion: 2h o+o +4e =4oh hydrogen evolution corrosion: 2h +2e =h
Effect of the concentration of oxygen in water. Under the condition that oxygen-depleting corrosion occurs, the increase in oxygen concentration is directly proportional to the corrosion. For example, the oxygen content of the feed water is higher than that of the condensate, so the corrosion of the feed water system is more severe than that of the condensate system.
In the hydrophobic system, because the trap tank is generally not sealed, the oxygen consumption corrosion is more serious.
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Anonymous users2024-02-09The negative electrodes are all fe-2e-=fe2+
Positive electrode: oxygen absorption corrosion: 2H2O + O2 + 4E-=4OH - Hydrogen evolution corrosion: 2H+ +2E-=H2
Iron is a metallic element with atomic number 26, iron elemental chemical formula: Fe, and an average relative atomic mass. 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, +2, +3, +4, +5 and +6 valences, of which +2 and +3 are more common, and +4, +5 and +6 are rare.
Iron is widely distributed in life, and the content of the earth's crust is second only to oxygen, silicon, and aluminum, ranking fourth in the earth's crust. Pure iron is a flexible and malleable silvery-white metal, used to make the core of generators and motors, iron and its compounds are also used to make magnets, drugs, inks, pigments, abrasives, etc., is one of the "ferrous metals" in the industry.
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Anonymous users2024-02-08Oxygen absorption corrosion: negative fe-2e-=fe2+
The positive electrode O2+2H2O+4E-=4Oh-
Total reaction 2Fe+O2+2H2O=Fe(OH)2 (precipitation) Hydrogen evolution corrosion Negative Fe-2E-=Fe2+ Positive 2H+2E-=H2
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Anonymous users2024-02-074fe+3o2+6h2o=4fe(oh)3。The oxygen corrosion of iron is divided into two steps, the first step is 2Fe + O2 + 2H2O = 2Fe (Oh) 2, Fe (Oh) 2 continues to be oxidized: 4Fe (Oh) 2 + O2 + 2H2O = 4Fe (Oh) 3, the total reaction equation.
It is 4Fe+3O2+
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Anonymous users2024-02-06Yangling site lithopole: fe-2e=fe2+
Cathode: state o2 + 2h2o + 4e = 4oh-
Total reaction: 2Fe + O2 + 2H2O = 2Fe (OH) ruler 2
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Anonymous users2024-02-05Alkaline ionization: Fe(OH)3=(reversible)=Fe3++3OH-, Acid ionization: Fe(OH)3=(reversible)=H++FeO2-+H2O.
Iron hydroxide is an amphoteric compound, an amphoteric compound, a compound that can exhibit both acidity and alkalineness, and its central element must be in the salt formed by the reaction of the compound with acid and alkali.
Iron hydroxide, chemical formula Fe(OH)3, is brown or reddish-brown powder or colloid, used to make pigments, drugs, used as water purification agent (colloidal), can also be used as an antidote to arsenic, etc.
Brown or reddish-brown powder or colloid, dispersed into colloids under certain conditions. Density. It has amphoteric but its alkalinity is stronger than acidity, iron hydroxide is insoluble in inorganic acids and organic acids, and can be soluble in hot concentrated alkali to form trisodium hexahydroxyferrate.
It has amphoteric but its alkalinity is stronger than acidity, and hydrated iron oxide is soluble in inorganic acids and positive organic acids, and can also be soluble in hot concentrated alkalis. With a strong oxidizing agent (such as sodium hypochlorite) in an alkaline medium, it can oxidize iron hydroxide to sodium ferrite (Na2FeO4) in a +6 oxidation state. When heated, it gradually decomposes into iron oxide and water.
Insoluble in water, ether, acid and ethanol. Iron hydroxide can be used to make pigments, medicines, and can also be used as an antidote to arsenic.
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Anonymous users2024-02-04Alkaline ionization: Fe(OH)3=(reversible)=Fe3++3OH-, Acid ionization: Fe(OH)3=(reversible)=H++FeO2-+H2O.
Iron hydroxide is an amphoteric compound, an amphoteric compound, a compound that can exhibit both acidity and alkalineness, and its central element must be in the salt formed by the reaction of the compound with the acid and alkali. Iron hydroxide, chemical formula Fe(OH)3, is brown or reddish-brown powder or colloid, used to make pigments, drugs, used as water purification agent (colloidal), and can also be used to make arsenic'antidotes, etc.
Brown or reddish-brown powder or colloid, dispersed into colloids under certain conditions. Density. It has amphoteric but its alkalinity is stronger than acidity, iron hydroxide is insoluble in inorganic acids and organic acids, and can be soluble in hot concentrated alkali to form trisodium hexahydroxyferrate.
Reed is amphoteric but its alkalinity is stronger than acidity, and hydrated iron oxide is easily soluble in inorganic acids and organic acids, and can also be soluble in hot concentrated alkali. It has a strong oxidizing agent (such as sodium hypochlorite) in the alkaline reed belt medium, which can oxidize iron hydroxide to sodium ferrite (Na2FeO4) in a +6 oxidation state. When heated, it gradually decomposes into iron oxide and water.
Insoluble in water, ether, acid and ethanol. Iron hydroxide can be used to make pigments, medicines, and can also be used as an antidote to arsenic.
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Because the material composition has two H, one Fe, and four O, it can be combined in this way, and because it is a salt, it can hydrolyze H+, and OH- two ions, and for Fe(OH)3, the hydrolysis of OH- is more, so it is alkaline and is an alkaline salt. The latter is the same, and the reason why it is called ferric acid or silicic acid is because it can be transformed into the universal form of this acid.