Iron and copper oxide first react with sulfuric acid

Everything reacts at the same time.

The so-called sequential reaction is artificially determined for the convenience of understanding and calculation, while in the collision of microscopic particles, as long as the effective collision occurs, the reaction can occur, and it is not restricted by other ions, so it is a simultaneous reaction.

And we say that this first reaction, that later reaction, because the reaction products of the later reaction will react with the reactants that reacted first, and regenerate the reactants of the later reaction, so that it looks like there is a sequential reaction.

For example, Zn and Fe are put into CuSO4 solution at the same time, and the two react at the same time, Zn and Fe dissolve, forming ZnSO4 and FeSo4 respectively, but Zn will react with FeSo4 to form Fe, which means that Fe and CuSO4 have no reaction, so it is considered that Zn reacts first.

Iron and copper oxide, after the two react with sulfuric acid, they form Feso4 and Cuso4 respectively, iron cannot react with Cuso4 to form Cuo, and Cuo cannot react with Cuso4 to form back iron, so these two reactions cannot be regarded as which reacts first and which reacts later, that is, they react at the same time.

In this problem, because there is no phenomenon when adding iron sheets, it proves that Fe has replaced all the Cu in CuSO4 in the previous reaction, so the insoluble matter must contain Cu element. If the sulfuric acid is insufficient in the previous step, Fe and Cuo will not be sufficiently dissolved, and may contain precipitates of both.

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Copper oxide, metathesis reaction takes precedence over this displacement reaction.

React at the same time!

In the reaction you described, both iron and copper oxide are solids that move "not so freely". There is only one thing that plays a key role in the reaction, and that is the H+ ions, and nothing else.

So whether the H+ ions hit CUO, or FE, is obviously a random event,The two occur at the same time, and there is no question of sequentiality.

Of course, the more interesting thing about your question is that as the reaction progresses, Cu2+ will be generated, Cu2+ will take precedence over H+ and Fe replacement, and begin to snatch the right of H+ to collide with Fe, and the exchanged Cu will cover the iron surface to prevent the reaction from proceeding.

So what you are talking about is the process of this reaction that is ---The gas is produced after the mixture is put in, but as the reaction progresses, the gas is produced more and more slowly, and the solution slowly turns green first and then blue.

Because the reaction of these two substances with dilute sulfuric acid is two reactions that are independent of each other. So both react at the same time.

cuo h2so4 cuso4 ten h2o

FE 10 H2SO4 FES04 10 H2

But in these two reactions, the generated Cus04 occurs with the unreacted iron:

cuso4 ten fe cu ten fes04

Copper oxide and iron powder are put into dilute sulfuric acid in copper oxide reaction first, and the two substances are put into dilute sulfuric acid at the same time to form a reaction of Lewis acid and Lewis base, Lewis acid-base reaction rate is the fastest and then is the redox reaction, only when the copper oxide reaction is complete and there is an excess of hydrochloric acid, hydrochloric acid begins to directly generate hydrogen with iron powder.

It can also be judged by the liveliness of metal.

Copper oxide and iron react at the same time with sulfuric acid, which is one of the most reactive binary inorganic acids that can react with most metals. High concentration of sulfuric acid has strong water absorption, can be used as a dehydrating agent, carbonized wood, paper, cotton and linen fabrics and biological skin and other carbohydrate-containing substances.

When mixed with water, a large amount of heat energy is also emitted. It is highly corrosive and oxidizing, so it should be used with caution. It is an important industrial raw material, which can be used to make fertilizers, medicines, explosives, pigments, detergents, batteries, etc., and is also widely used in purifying petroleum, metal smelting and dyes and other industries.

It is often used as a chemical reagent and can be used as a dehydrating agent and sulfonating agent in organic synthesis.

fe+cuso₄=feso₄+cu。

Displacement reaction. Iron reacts with a solution of copper sulfate to form ferrous sulfate and copper. Iron is more mobile than copper and can be replaced.

Phenomenon: The blue solution gradually disappears, and a red solid precipitates. Iron reacts with copper sulfate to form iron sulfate and copper, and the reaction equation is as follows:

fe+cuso₄=feso₄+cu。

fe+cuso4=feso4+cu

Displacement reaction. Iron reacts with a solution of copper sulfate to form ferrous sulfate and copper. Iron is more mobile than copper and can be replaced.

Phenomenon: The blue solution gradually disappears, and a red solid precipitates. Iron reacts with copper sulfate to form iron sulfate and copper.

1. In the agricultural field, Bordeaux liquid is formed after mixing with lime water, which is used as a fungicide to control fungi on crops and prevent fruit from rotting; Since copper ions are toxic to fish, the dosage must be strictly controlled. Aquaculture is also used as the main raw material for feed additives trace element copper;

2. Dehydrating agent for alcohols and organic compounds. Gas desiccant.

3. Chemistry education, copper sulfate is usually included in children's chemical experiment reagents, used for crystal formation experiments and electroplating copper experiments. Because of its toxicity, it is not recommended for young children. Copper sulphate can also be used to demonstrate the process of crystalline water loss weathering and obtaining crystallized water.

In the junior high school laboratory examination, the law of conservation of mass was verified by the displacement reaction between copper sulfate and iron.

Because ferric iron has strong oxidation, and elemental copper has strong reducibility, this reaction is a redox reaction, but also a displacement reaction, and the reaction produces ferrous sulfate and copper elemental wisdom.

Reaction phenomenon: When the iron wire is put into the copper sulfate solution, you will see that a layer of red metallic copper is gradually formed on the surface of the iron wire. If the iron powder is put into the copper sulfate punch solution, then with the dissolution of the iron powder, there is a precipitation of red metal powder, that is, the pre-copper element, and the color of the solution becomes lighter and lighter (blue becomes light green).

The reaction between iron and copper sulfate solution is that the iron is gradually dissolved, the blue color of the solution fades, and the red solid precipitates to form a green solution.

In the order of metal activity, iron precedes copper, so iron can replace the copper in copper sulfate with elemental copper, and at the same time form ferrous sulfate.

Among them, the precipitate composition of the reaction between copper sulfate and iron mainly depends on the ratio of the amount of copper sulfate to iron, when the ratio of the amount of the two substances is less than or equal to one to one, the precipitation is copper; When the ratio of the quantities of the two substances is greater than one to one, the precipitate is copper and iron.

Reaction phenomenon: iron dissolves, the surface of the silvery-white iron sheet is covered with a layer of red substance, copper adheres to the iron, and the solution changes from blue to light green.

Reaction principle: Iron ions are more active than copper ions, and copper ions are replaced, or the reduction of iron, reduces copper ions.

Reaction type: displacement reaction, displacement reaction is that the active substance will be replaced by the lazier substance.

Experimental phenomenon. Copper sulfate is a white or off-white powder, and its aqueous solution is weakly acidic and blue. Copper sulphate is an important raw material for the preparation of other copper-containing compounds.

Bordeaux liquid can be obtained by mixing with lime milk, which is used as a fungicide. At the same time, copper sulfate is also the electrolyte used in electrolytic refining of copper.

Copper sulfate has no melting point at normal pressure, decomposes after losing crystal water after heating, is very stable at room temperature and pressure, does not deliquescent, and will gradually weathered in dry air. Copper sulfate is the crystallization of the blue asymmetrical triclinic crystal system, specific gravity.

It is chemically stable at room temperature, easily soluble in water, and can be dissolved in 15C water, and its aqueous solution is blue and acidic. If left in the air for a long time, it will gradually lose its crystalline water and turn white. <>

Iron reacts with copper sulfate solution to form ferrous sulfate and copper, and the chemical equation of the reaction is: Fe+CuSo4 Feso4+Cu

Copper is a red substance that adheres to the surface of iron, and the solution gradually changes from blue to light green. Iron is more reactive than copper, and iron reacts with copper sulfate to form ferrous sulfate and copper. Displacement reaction.

The reaction solution of iron and dilute hydrochloric acid (dilute sulfuric acid) changes from colorless to light green, bubbles emerge, and iron is gradually decreasing or disappearing; The reaction between iron and copper sulfate, copper is a red substance, attached to the surface of iron, and the solution gradually changes from blue to light green, because the ferrous sulfate solution is light green, and with the progress of the reaction, the solution gradually turns light green

Expansion: Displacement reaction is a chemical reaction in which an element reacts with a compound to form another element and compound, and is one of the four basic reaction types in chemistry, including the reaction between metal and metal salt, the reaction between metal and acid, etc. It is a reaction of one element with one compound to produce another element with another compound.