3 valent iron ion Fe3 and mercury ion Hg2 who are highly oxidizing

Although Fe is ahead of Hg in the order of metal activity, this only indicates that the oxidation of ferric ions is weaker. For ferric ions, it is more oxidizing than mercury ions. For example, in the principle of reelectrolysis, the cathode discharge sequence trivalent iron ions precede mercury ions.

Therefore, the oxidizing property of ferric ions is stronger than that of mercury ions.

It is Hg According to the most basic principles in chemistry, there are metal reductions, k, ca, na, mg, al, zn, fe...cu,hg,ag...The metallicity decreases sequentially, and the oxidation increases sequentially.

This question should not only look at the surface, but also according to the reality.

In an acidic standard environment, e(hg2+ hg2(2+)))=e(hg2+ hg)=

e（fe3+/fe2+）=。

Theoretically, it's hg2+ strong, isn't it?

The metal activity table only reflects the ratio of the reducible oxidation of the metal to its most common ionic transition.

The specific oxidation of uncommon ions should be checked in the potentiometer, which is the thing sent upstairs upstairs.

It seems that HG+2 is stronger ......

Right·· In the case of secondary school chemistry, it is 3-valent Fe

Chemical reaction of ferric iron with hydrogen peroxide: 2Fe + H O +2H = 2Fe +2HO.

The addition of hydrogen perperoxide to oxidize ferric iron under acidic conditions is based on the oxidation of ferric iron to ferric iron, and the hydrolytic pH value of ferric iron is low, so when pH = about 3, iron hydroxide precipitation will be generated.

Ionization occurs when a weak acid is associated with a weak base, and hydrolysis is produced by the acid ions of a weak acid and the cation of a weak base, so it is necessary to clarify the solute. In the case of simultaneous ionization and hydrolysis in the solution, only the acid acid of the weak acid can be both hydrolyzed and ionized, just remember it, bicarbonate, thibion ions, monohydrogen phosphate hydrolysis is greater than ionization.

When the oxidation is completed, the trivalent iron precipitate is formed, and then sulfuric acid is added, the pH value is reduced, and when the pH drops to a certain value, the precipitate will dissolve into the solution, so the precipitated iron in the solution will not be precipitated.

Fe3+ is the catalyst Fe3+ 2H2O2—— 2H2O+O2 First Fe3+ is hydrolyzed to form Fe(Oh)3. Hydrogen peroxide is weakly acidic and reacts with Fe(OH)3 to form iron peroxide. The peroxide of iron reacts with water to regenerate Fe(Oh)3 and O2 at the same time.

Finally, H+ reacts with Fe(OH)3 to regenerate Fe3+. Thus, Fe3+ only plays a catalytic role in this process.

It can not coexist, it can be simply understood that a catalytic reaction will occur, and it can be explained by the Fenton reaction H2O2 + Fe3+ Fe2+ +O2 + 2H+——Fe2+ +H2O2 Fe3+ +Oh)-+OH—— O2 + Fe2+ Fe3+ +O2—— It can be seen that in addition to the generation of 1 molar of OH radicals, the Fenton reagent is also accompanied by the generation of 1 molar peroxy radicals O2·, but the oxidation potential of peroxy radicals is only about V, so, The main oxidizing effect in the Fenton reagent is the oh·free radical.

Hydrogen peroxide is reducible, whereas ferric ions are oxidizing and undergo redox reactions.

However, because the reduction of ferric ions produced after the reduction of ferric ions is greater than that of peroxides, redox reactions will occur.

The ferric ions are continuously consumed in the reaction and generate the same amount of iron ions, so the ferric ions remain unchanged, and the hydrogen peroxide will decompose more quickly to produce oxygen and water, that is, the ferric ions are ultimately catalyzed by the decomposition of hydrogen peroxide.

Unable to coexist, Fe3+ catalyzes the decomposition of H2O2.

ag+〉fe3+〉cu2+

The more reactive the metal, the easier it is for the metal to participate in the reaction to form the corresponding ions, and the product is correspondingly more stable, that is, the ions of the active metal are not easily reduced to metals.

On the contrary, the less active the metal, the more difficult it is to form ions, but these ions are very unstable and easy to be reduced, that is, it is easy to oxidize other substances, so the oxidation is strong.

Because Cu+2Fe3+=3Fe2++Cu2+, Fe3+ Cu2+,2 compares the oxidation strength of Cu2+, Fe3+ and Ag+ ions.

Why!

Both ferric iron and copper ions are common transition metal ions that play an important role in chemical reactions. In the oxidation reaction, the oxidation of these two ions is different. Let's analyze who is more oxidizing in them.

Firstly, the electronic structures of ferric iron and copper ions are not leased and the same band. The electronic structure of ferric iron is [ar]3d 5 with five unpaired electrons, whereas the electronic structure of copper ion is [ar]3d 10 with one unpaired electron. This means that the electron cloud of ferric iron is looser and more prone to losing electrons, making it more oxidizing.

Secondly, the standard electrode potentials for ferric iron and copper ions are also different. The standard electrode potential for laughing liquid trivalent iron is +, while the standard electrode potential for copper ions is +. This means that ferric iron is more easily oxidized to ferric, while copper ions are more difficult to be oxidized into substances.

As a result, ferric iron is more oxidizing.

In summary, ferric iron is more oxidizing than copper ions. In chemical reactions, we can use the oxidation of ferric iron to promote the oxidation reaction, so as to obtain the product we need.

Oxidation: Oxidizing agent oxidation product.

The trivalent iron salt solution reacts with copper, and the iron is reduced to 2-valent iron, and the copper increases from 0 to 2 valence, so the oxidation of iron is stronger than that of copper ions.

Iron is placed in the copper sulfate deficiency solution, and the iron can replace the copper and become ferrous ions by itself, and the oxidation of copper ions is stronger than that of ferrous ions.

Therefore, the oxidation order of the three ions is: iron ions, copper ions, and ferrous ions.

Chlorine is highly oxidizing.

Cl2+2Fe2+===2Fe3+ +2Cl- The oxidant is Cl2 and the oxidation product is Fe3+

The oxidizing agent is more oxidant than the oxidation product.

Chlorine is oxidized more than ferric ions.

Because Cl2+2Fe2+===2Cl- +2Fe3+ oxidant is: Cl2

Oxidation product: Fe3+

The oxidation of the oxidant is greater than that of the oxidation product.

So Cl2>Fe3+

Iron is burned in chlorine gas and directly becomes ferric iron.

Therefore, chlorine gas is more oxidizing than ferric ions.

Solution: The oxidation of ferric ions is stronger than that of copper ions for the following reasons: the oxidation of redox reactions is relatively strong, and the oxidation of oxidants is greater than that of oxidation products

2Fe3+ +Cu = 2 Fe2+ +Cu2+ Here Fe3+ is the oxidizing agent and Cu2+ is the oxidation product. So: Fe3+ > Cu2+