Ferric acid H2Fe2O4 becomes iron hydroxide Fe OH 3, and orthosilicate H4Si2O4 is also silicon hydrox

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.

Is Fe(OH)2(H2O)4]+ easy to turn into iron hydroxide?

The air is oxidized to iron hydroxide: 4Fe (OH) 2 + O2 + 2H2O = 4Fe (OH) 32 ferric ions are unstable and quiet, and the imitation slag is reducible, and it is easy to react with the oxygen in the air.

2Fe + 3Cl2 === Heating = = 2FeCl3FeCl3 + 3KOH ==Fe (Hail Fierce OH) 3 (Call Cavity Precipitation Source Link Bridge) +3kCl

2cu+o2==heating==2cuo

cuo+h2so4+4h2o===

Answer: SiO2 is a strong and refractory solid and other minerals that make up a variety of rocks, and its chemical stability is also reflected in the fact that it does not react with ordinary acids.

However, hydrofluoric acid (HF) is the only acid that reacts with SiO2, and depending on the amount of the reactant, it can form gaseous silicon tetrafluoride, or further combine with hydrofluoric acid to form fluorosilicic acid (H2SIF6). Note that the reactor should not be made of glassware, it should be made of polyester.

sio2+4hf=sif4↑+2h2o

sio2+6hf→h2sif6＋2h2o

Iron in iron hydroxide refers to 3

2 Iron is called ferrous steel, and Fe(OH)2 is called ferrous hydroxide.

The conditions for metathesis reactions are the formation of gas, precipitation, or water (junior high).

Iron hydroxide Fe(OH)3 can react with hydrochloric acid to produce water, which meets the conditions.

For some of the more specific reactions, in addition to the general requirements (gas, precipitate or water generation), there are also special requirements: for salts and alkalis, salts and salts, the precipitate cannot be reactive (the reactants must be soluble).

Which OH roots are precipitated: look at the solubility table at the back of the book, you can know.

mg al zn fe sn pb cu ..

Who says precipitation can't react?

Isn't CaCO3+HCl used to produce CO2 in the laboratory?

Don't forget everything in front of you after you learn.

The precipitation in the junior high school stage cannot react, and it is limited to salt + salt and salt + alkali.

After high school, there are no restrictions at all, as long as the conditions are met, so junior high school things are very superficial, you don't have to ask why, just memorize.

Fe(OH)3+3HCl=FeCl3+3H2O Iron hydroxide behaves as alkaline and hydrochloric acid reaction to form water and soluble ferric chloride.

This is acid-base neutralization, regardless of the state of the reactants. You're talking about salt and alkali, and salt and salt reaction should be a solution. ps.Alkali precipitates can react with strong acids.

...Hydrochloric acid is an acid, iron hydroxide is a base, acid-base neutralization reaction, of course, it will react, all hydroxide will react with hydrochloric acid, sulfuric acid, nitric acid and other strong acids, precipitation is not reactive, which means that after the reaction, the degree of dissolution in the front is greater than that in the back, so that it will not react.

Dense alumina reacts with hydrogen ions – here H+ is not provided by concentrated sulphuric acid.

Iron oxide can also react with hydrogen ions – the H+ here is also not provided by concentrated sulphuric acid.

Iron that has been passivated by concentrated sulphuric acid – can react with dilute sulphuric acid.

At room temperature, in concentrated sulfuric acid, sulfuric acid mainly exists in the form of molecules, and it is difficult to ionize H+, and because concentrated sulfuric acid has strong oxidation, it can passivate aluminum and iron, but there is a large amount of H+ in dilute sulfuric acid, which can react with aluminum, iron, alumina, and iron oxide.

It will definitely be able to react, and once the passivated iron reacts with dilute acid, the passivated layer will be destroyed. Iron oxide reacts with hydrogen ions, and concentrated sulfuric acid does not exist as hydrogen ions.

Iron oxide is opposite to hydrogen ions, and does not react with concentrated sulfuric acid because concentrated sulfuric acid cannot ionize hydrogen ions, so it does not react.

It must be concentrated sulfuric acid that passivates the iron, and when heated, it reacts with hydrogen ions.