Nitric acid with active metals reflects why not hydrogen is generated, but nitrogen oxides

This is because nitric acid is very oxidizing.

In fact, hydrogen can be generated, and when the concentration of nitric acid is relatively small, it may be hydrogen.

Theoretically, nitrogen reacts with oxygen and water to form nitric acid.

First of all, under discharge conditions, nitrogen can be combined with oxygen to form nitric oxide

N2 + O2 = Discharge = 2NO

Nitric oxide then rapidly combines with oxygen to produce nitrogen dioxide:

2no+o2=2no2

Finally, nitrogen dioxide reacts with water to form nitric acid:

3no2+h2o=2hno3+no

To illustrate, step 1 reaction can be reacted like this if there is sufficient oxygen:

4no+3o2+2h2o==4hno3

If you want to write a large chemical equation, you can write 2N2 + 5O2 + 2H2O = Discharge = 4Hno3 (but it is not recommended to summarize it this way).

The reason why nitric acid does not produce hydrogen when it reacts with metals is because nitric acid is a strong oxidizing agent, and nitrate ions have greater oxidation than hydrogen ions, so hydrogen does not participate in the oxidation reaction, so hydrogen gas is not produced.

Nitric acid is a strong acid with strong oxidation and corrosiveness, which belongs to the monologic inorganic strong acid, is one of the six major inorganic strong acids, and is also an important chemical raw material. It can be used in industry to make fertilizers, pesticides, explosives, dyes, salts, etc.; In organic chemistry, the mixture of concentrated nitric acid and concentrated sulfuric acid is an important nitrification reagent, and its aqueous solution is commonly known as nitrate water or ammonia nitrogen water.

Nitric acid can be esterified with alcohol to form the corresponding nitrate, in terms of mechanism, the esterification reaction involved in nitric acid was thought to form carbocation intermediates in the past, but many literatures describe the mechanism as Fischer esterification, that is, "acid dehydroxyl alcohol dehydrogenation" and carboxylic acid esterification mechanism is the same.

Nitrogen and hydrogen are combined to form ammonia, and the catalytic oxidation of ammonia produces NO, which is further oxidized to form NO2 and absorbs water to generate nitric acid

N2 3H2 2NH3 (Conditional High Temperature and High Pressure Catalyst) 4NH3 5O2 4NO 6H2O (Conditional Catalyst) 2NO O2 2NO2

4no2＋o2＋2h2o＝＝4hno3

Categories: Education, Science, >> Learning Aid.

Problem description: Why does the metal react with concentrated sulfuric acid and nitric acid to produce hydrogen?

Analysis: Strong oxidizing acids and metals do not undergo a reduction reaction, but metals with metallicity (which can be understood as reduction) lose electrons, the valency increases, the ** element (S, N) in the strong oxidizing acid obtains electrons, the valency decreases, and the oxides (gases) containing this element are generally released, such as:

Cu + 2H2SO4 (concentrated) = CuSO4 + SO2 + H2O3Cu + 8HNO3 (dilute) = 3Cu (NO3) 2 + 2NO + 4H2OCU + 4HNO3 (concentrated) = Cu (NO3) 2 + 2NO2 +2H2O Therefore, the acidity of these acids is not hydrogen ions, but ** non-metallic elements.

In addition, active metals and nitric acid, which is very concentrated in very dilute concentrations, sometimes produce NH4NO3, and N2 is known when I learned about redox reactions (high school).

Nitric acid is strongly oxidizing.

Nitrate is more oxidizing than hydrogen ions under acidic conditions, so first nitrate ions oxidize metals to form nitrogen oxides (nitric oxide and nitrogen dioxide), and when nitrate ions react about the same, it is the turn of hydrogen ions that are less oxidizing to react with metals to produce hydrogen gas.

Hope it helps.

Nitric acid is a strong oxidizing acid, in which the n element acts first, and hydrogen does not participate in the reaction. So instead of hydrogen, nitrogen oxides or even nitrogen are generated.

n +o = (energized) = 2no; 2no+o₂=2no₂；h₂o+3no₂=2hno₃+no。

Nitrogen is the most abundant element in the air, which is widely present in nature and has a great role in living organisms, and is a component of amino acids.

One of the basic elements.

The percentage by weight content of nitrogen in the earth's crust is that the proteins carried by animals and plants contain nitrogen. There are nitrates in the soil.

For example, kno. in South America.

Chile has saltpeter (nano), the only deposit of its kind in the world, which is a rare nitrogenous deposit. Nitrogen-containing molecules, such as NH, HCN, etc., have been found in the cosmic star internucleus.

Generally speaking, the metal reacts with concentrated nitric acid, and the reduction product is NO2 and the reduction product reacts with dilute nitric acid, and the reduction product is.

no。But in some of the topics given to the message, there are other cases.

Such as talking about omissions. Reactive metals such as.

mgal,zn

etc., react with nitric acid in extremely dilute acres, and the reduction product can be.

n2o, n2, even.

There are NH4NO3 such as. 4mg

10hno3

4mg(no3)2

n2o ↑5h2o

4zn10hno3=

4mgno3)2

nh4no3

3h2o5zn

12hno3

5zn(no3)2

n2↑6h2o