Is it necessary to continuously introduce nitrogen when heating ferrous sulfate solids?

Solution: ammonium ferrous sulfate is completely decomposed in 500 hours isolated from air heating, redox reaction occurs, FE elements generate FEO and FE2O3, some FE elements lose electrons and oxidation reaction, gas products may have NH3, SO3, H2O, N2, some N elements lose electrons and oxidation reaction, so there are electrons in the electron reduction reaction of the elements obtained in ammonium ferrous sulfate, so SO2 is also generated, after the solid in A is fully heated for a long time, The purpose of introducing nitrogen is to make the gas produced by decomposition be fully absorbed in devices B and C, so the answer is: to make the gas produced by decomposition be fully absorbed in devices B and C;

The function of the BAC12 solution in device B is to check whether there is SO3 gas in the decomposition product, if it contains this gas, it will generate a barium sulfate white precipitate, and the observed appearance is that the solution becomes turbid;

Therefore, the answer is: the solution becomes turbid or appears white precipitate;

There is a white precipitate in C, because SO2 is oxidized by hydrogen peroxide to SO42-, SO42- and then combined with BA2+ to form a precipitated BaSO4, then the reaction that occurs in C is SO2+H2O2+BA2+=BASO4+2H+, so the answer is: SO2+H2O2+=BASO4+2H+ (or SO2+H2O2=2H++SO42-, SO42-+BA2+=BASO4).

Nitrogen reacts with ferrous sulfate to heat the product as the title of these two do not react.

(1) Sulfur dioxide can fade the potassium permanganate solution, so the answer is: sulfur dioxide.

2) In the experiment, nitrogen should be continuously introduced to drive out all the water vapor grinding mills, otherwise the measured x will be small, so the answer is: small.

3) ferrous sulfate crystals will lose crystal water when heated, and will continue to decompose at high temperature to produce metal oxides and non-metallic oxides, combined with the reddish-brown solid in A, put in dilute hydrochloric acid with a full base of base, and the solid will all be dissolved, and the information of the yellow solution will be obtained, so the reddish-brown solid in A is iron oxide; So the answer is: iron oxide.

4）feso4

The decomposition product is Fe2

o3、so2

SO3, trim is sufficient, so the answer is: 2FeSO4FE2O3

so2↑+so3

5) The function of the device D spherical dryer is: the effect of drying the gas and preventing the sodium hydroxide solution from sucking, so the answer is: the effect of drying the gas and preventing the sodium hydroxide solution from sucking.

6) Pass feso4

The chemical formula of Xh2O shows that the ratio of iron atoms to water is 1:2X, Fe2O3 2XH2

o160 36x

8gx=7, so the answer is: 7

Protective effect, preventing ferrous sulfate from being oxidized and preventing reaction with oxygen in the air.

Because ferrous Fe2+ is reducible, it is easily oxidized by oxygen in the air and becomes ferric iron when heated.

The two do not react. Nitrogen is an inert gas with relatively stable properties that prevent ferrous sulfate from being oxidized by oxygen in the air.

1) According to the re-ignition of the wood strips, there is oxygen generation, according to the solid in A becomes reddish-brown, it means that the solid in A becomes reddish-brown for iron oxide, and there is white precipitate for barium sulfate in B, because ferrous sulfate is heated and decomposed in isolation air under the condition of nitrogen to form iron oxide and sulfur dioxide, so the ion equation of the experimental reaction is Fe2O36H+

2fe3+3h2

o, so the answer is: fe2O36H+

2fe3+3h2

o；2) According to the characteristics of the redox reaction, the valence of the element valence is increased is equal to the valence of the element valence decreased, and the decomposition process produces the gas that rekindles the wood strip as oxygen, indicating that the valency of the oxygen element is increasing, and the solid in A becomes reddish-brown for iron oxide, because there is Fe2

O3 is generated, and the valency of iron is also increasing, in Feso4

Only the +6-valent S element is oxidizing and can be reduced, so there must be SO2

generated, so the answer is: SO2

Because there is fe2

O3 is generated, in feso4

Only the +6-valent S element is oxidizing and can be reduced, so there must be SO2

Generate; 3) Take the solid in A and add hydrochloric acid Fe2

o36hcl=2fecl3

3H2O, the obtained solution is dropped into the D test tube, the solution turns light green, indicating that there is divalent iron generation, indicating that the ferric ions are reduced, and the colorless liquid in the D test tube is sulfur dioxide, and the reaction that occurs is 2Fe3+

so22h2

o=2fe2+so4

4h+, so the answer is: 2fe3+

so22h2

o=2fe2+so4

4H+4) Because ferrous sulfate is isolated from the air under the condition of nitrogen, the heating and decomposition must produce iron oxide and sulfur dioxide, not necessarily sulfur trioxide, and the phenomenon in B is that there is a white precipitate, and the white precipitate is barium sulfate, which may be 2SO2O22H2

o=2h2so4h2so4

bacl2baso4

2HCl, so regardless of whether the decomposition reaction has SO3 or not

generated, there will be this phenomenon, and the total reaction is 2SO2O22H2

o+2bacl2

2baso4

4HCl, so the answer is: incorrect, because the decomposition has O2

and SO2 is generated, which reacts in an aqueous solution: 2SO2O22H2

o=2h2so4

Therefore, regardless of whether the decomposition reaction has SO3 or not

generated, will have this phenomenon; 2so2o22h2

o+2bacl2

2baso4

4hcl．

A small amount of yellow-brown precipitate of the ferrous sulfate solution was heated; Because heating the ferrous sulfate solution oxidizes ferrous ions to iron ions and becomes iron sulfate, and the solubility of iron sulfate is less than that of ferrous sulfate, it will produce precipitation, and the final crystallization obtained is iron sulfate.

4feso4+o2+3h2so4=2fe2(so4)3+2h2o

First of all, the question of whether it will generate a base, that is, Fe(Oh)3, assuming that it will be generated, then it can only be obtained by oxidation of Fe(Oh)2 obtained by hydrolysis, but 1molFe(Oh)2 will be generated, and 1molH2SO4 will be generated at the same time, sulfuric acid is a strong acid, so Fe(Oh)2 will not be generated and precipitated in large quantities, so we say that hydrolysis is a weak reaction. Besides, whether Fe2(SO4)3 will be generated, the answer is no, the oxidation of Fe2 in the air can only be carried out under acidic conditions, that is, 4Fe2 O2 4H = 4Fe3

Nitrogen is an inert gas and generally does not react with ferrous sulfate. In nitrogen, it can prevent ferrous sulfate from being oxidized and prevent ferrous sulfate from reacting with oxygen in the air.

Nitrogen, with the chemical formula N2, is usually a colorless and odorless gas, and nitrogen is generally less dense than air. nitrogen is the main component of air. At standard atmospheric pressure, when cooled, it becomes a colorless liquid, and when cooled, solid nitrogen becomes a snow-like solid.

Nitrogen is chemically inactive, and it is difficult to react with other substances at room temperature, so it is often used to make preservatives. However, under high temperature and high energy conditions, it can undergo chemical changes with certain substances and be used to make new substances useful to human beings.

Nitrogen does not react with ferrous sulfate.

Due to the strong acidic environment produced by SO3 dissolved in water, there can be no BaSO3 generation, only BaSO4 (equivalent to HNO3 in the solution), and HNO3 cannot absorb all SO2, so there will be SO2 precipitation solution, because H2SO4 is produced, so OH will be reduced.

Of course, it is not possible for SO3 to escape.

It's very good that he answered for a long time, you can't understand that question, it's wrong, right?