The phenomenon of alkali metals in liquid ammonia? Urgent!

Liquid ammonia. It is a good non-aqueous solvent that ionizes itself similarly to this water.

2nh3 → nh4+ +nh2-

and alkali metals. There are 2 main phenomena in the reaction, the first is bubbles, Na + NH4 + NA+ +1 2H2 + NH3

The second is the blue solution.

This is explained in solvent chemistry at university, so if you are interested in studying chemistry in the future, you will know about it.

Blue solution, because of the formation of ammonia electrons and cations of ammonia alkali metals.

na + m+n)nh3== na(nh3)m+ +e(nh3)n-

The blue color is due to the ammonia electrons, so all alkali metals dissolved in liquid ammonia have the same color, which is blue.

Any alkali metal, dilute solution dissolved has the same absorption wavelength of blue light. Experiments have shown that this species is an ammonia electron, and the electrons are in 4 6 NH3 "holes".

There are bubbles, metal churning, steaming.

One of the properties of alkali metals is that they can be dissolved in liquid ammonia, and their dilute solution is blue, and with the increase of solution concentration, the color of the solution deepens. When the concentration exceeds 1mol|l, a bronze color appears on the original dark blue solution. As the concentration continues to increase, the solution changes from blue to bronze.

This solution is evaporated, and alkali metals are obtained.

It is believed that the following equilibrium exists in the dilute solution of alkali metals: m(s) + (x + y) nh3(l) = m(nh3) x + e(nh3)y

Calcium, strontium, and barium can also be dissolved in liquid ammonia to form a blue solution, which dissolves more slowly and in smaller quantities than sodium.

Ammonia. There is some chemical equilibrium in .

Therefore, only a small fraction of ammonia molecules react with water to form ammonium ions.

and hydroxide ion oh-, so it is weakly alkaline.

In addition, the weak alkalinity of ammonia can make colorless phenolphthalein test solution.

Turning red can make the purple litmus test solution blue, and can make the wet red litmus test paper blue. This method is commonly used in laboratories to test for the presence of NH3. It can also react with acids to form ammonium salts.

Concentrated ammonia encounters with volatile acids such as concentrated hydrochloric acid.

and concentrated nitric acid) will produce white smoke, which will not occur if it encounters non-volatile acids (such as sulfuric acid, phosphoric acid).

There is some chemical equilibrium in ammoniaTherefore, only a small part of ammonia molecules react with water to form ammonium ions and hydroxide ions oh-, so they are weakly alkaline. In addition, the weak alkalinity of ammonia can make the colorless phenolphthalein test solution red, the purple litmus test solution blue, and the wet red litmus test paper blue. This method is commonly used in laboratories to test the presence of NH3.

It can also react with acids to form ammonium salts. Concentrated ammonia will produce white smoke when it encounters volatile acids (such as concentrated hydrochloric acid and concentrated nitric acid), and this phenomenon will not occur if it encounters non-volatile acids (such as sulfuric acid and phosphoric acid).

The above content reference: Encyclopedia - Ammonia.

The following reaction occurs: 2Na + 2NH3 = 2NanH2 + H2

Sodium is a metal element, located in the 3rd period and group ia in the periodic table, and is a representative of alkali metal elements, with a soft texture, which can react with water to form sodium hydroxide, release hydrogen, and have more active chemical properties. Sodium is widely distributed in the form of salt on land and in the sea, and sodium is also one of the important components in human muscle tissue and nerve tissue.

Properties: The chemical properties of sodium are very active, and when heated at room temperature and heated, they are combined with oxygen, and react violently with water, and occur when the amount is large. Sodium can also be burned in carbon dioxide, react with low-element alcohols to produce hydrogen, and react with liquid ammonia, which has a weak ionization capacity.

Storage method: Immersed in liquid paraffin, mineral oil and benzene series sealed and preserved, a large amount is usually stored in iron drums filled with argon gas sealed for preservation. Sodium metal cannot be stored in kerosene because it reacts with organic acids and other substances in kerosene to form organic acids and other substances (yellow) that adhere to the surface of sodium. When stored in paraffin oil, oxygen from the air also enters the paraffin oil, graying the surface of the sodium metal and forming an oxide film.

Application: 1. Industrial use: determination of chlorine in organic matter; reducing and hydrogenated organic compounds; Detection of nitrogen, sulfur and fluorine in organic matter; removal of water from organic solvents (benzene, hydrocarbons, ethers); removal of impurities such as oxygen, iodine or hydroiodic acid from hydrocarbons; Preparation of sodium amalgamation, sodium alkoxide, pure sodium hydroxide, sodium peroxide, sodium amino, alloy, sodium lamp, photocell, and active metal.

2. Physiological effects:

Sodium is an important inorganic element in the human body and plays a very important role in the human body.

1) Sodium is the main positively charged ion in the extracellular fluid, which participates in water metabolism, ensures the balance of water in the body, and regulates the water and osmotic pressure in the body;

2) maintain the balance of acids and alkalis in the body;

3) It is a component of pancreatic juice, bile, sweat and tears;

4) Sodium is related to the production and utilization of ATP (adenine nucleoside triphosphate), muscle exercise, cardiovascular function, and energy metabolism, in addition, the utilization of sugar metabolism and oxygen also needs the participation of sodium;

5) maintain normal blood pressure;

6) Enhance neuromuscular excitability.

It does not react if it is only under the nitrogen flow.

Liquid ammonia is added to form a blue solution, which is the sodium that transfers electrons to ammonia and becomes ammonia electrons.

2na+2nh3 = 2nh2na + h2↑

The second is actually the reaction of sodium with water to produce sodium hydroxide, and at the same time, due to the rise in pH, ammonia will overflow.

It is not possible to produce a handle of salt, but it is possible to produce the complexed ions that you are talking about.

What reacts with alkali metals in liquid ammonia to get ionic compounds what.

Alkali metals react in liquid ammonia to give ionic compounds. For example, sodium reacts in liquid ammonia to give the sodium ammonia compound NanH2. This anti-sputation should be very hot, so a cooling device is needed to lower the temperature.

In addition, aluminium can also react in liquid ammonia to produce ionic compounds, such as the aluminium ammonia compound ALNH3. This reaction is also very hot and requires a cooling device to lower the temperature. In addition, alkali metals such as potassium, calcium, magnesium, and beryllium can also be reacted in liquid ammonia to produce ionic compounds.

These reactions also require a cooling device to reduce the temperature.

The reducing agent is reducible, so to judge the reducibility, you only need to find out whether the valency of the substance is increased.

Alkaline refers to the property of salt that is formed by reacting with an acid.

Ammonia is both reducing and alkaline, and it is necessary to find the equation for the increase in ammonia valency and the formation of ammonium salts.

The -3 valent nitrogen in ammonia in c produces nitrogen, which is reducible. At the same time, ammonia also produces ammonium chloride, which is alkaline.

There is no change in the valency of ammonia gasification in a, so there is no reduction.

The hydrogenation valency of +1 valence in ammonia in b decreases to produce hydrogen, which reflects oxidation.

The increase of the nitride valency of ammonia-3 in D produces NO, but ammonia does not form ammonium salt, so ammonia in the reaction is only reducing but not alkaline.

The correct answer is C, 8, and C.

In the redox reaction, the acidity and alkalinity of the oxidant or reducing agent refers to the property that the core elements of the oxidant or reducing agent in the reaction have a part of the valence unchanged, and the core element refers to the elements in the oxidant or reducing agent other than hydrogen and oxygen, and the acidity and alkalinity are not the acidity and alkalinity in the principle of acid-base neutralization.

In the reaction of 8NH3 3Cl2==N2 6NH4Cl, in the process of turning a part of NH3 into NH4Cl, the N element does not change valence, but is still the 3 valence in NH3, which reflects the alkalinity in redox. And the other part of NH3 becomes slag or argues as N2 over. 2. If there is a lack of C, the N in NH3 is -3 valence, and the N in N2 is 0 valence, and the compound valence is increased, and it is used as a reducing agent to reflect the reduction.

In NH4Cl, ammonium is used as a cation, so it reflects the alkalinity of ammonia. , 2, select C

In C, NH4Cl is generated, and NH3 is alkaline on the surface; There is N2 generation, indicating that NH3 is reductive.

A can only indicate alkalinity, B can only indicate oxidation, D can only indicate reduction, 1, answer C

The first reducibility:

In nh3 n+3 valence, the product is n2 and 0 valence, which shows that it has the property of getting electrons and has reductivity.

It reduces cl2 to cl-

2nd Alkaline:

NH4Cl in the product is salt, where Cl- is a strong acid group, NH4+ is the base in the group, and the corresponding NH3 shows alkaline, 1,C pair,0,C,0,【Gaoyi Chemical】The following reactions can indicate that ammonia is both reducing and basic.

Among the following reactions, which can indicate that ammonia is both reducing and basic, is (

heating) mg3n2 3h2

4NO 6H2O (= "catalyst" at the top, = "high temperature, high pressure" at the bottom).

(1) Ammonium bai sulfate is soluble in water.

After that, the ammonium ion hydrolysis of Du ammonium ion generates ammonia monohydrate and hydrogen ion DAO, the solution is acidic, and the hydrolysis ion equation is NH4++H2O?NH3 H2O+H+, so the answer is: NH4++H2O?

nh3．h2o+h+；(2) After aluminum chloride is dissolved in water, aluminum ions are hydrolyzed to form aluminum hydroxide and hydroxide ions, the solution is acidic, and the hydrolysis ion equation is AL3+.

The precipitate X is SiO2, SiO2 does not react with dilute hydrochloric acid, and the solutes in the filtrate are HCl, MgCl2, AlCl3 and FeCl3. a.False, H2SiO3 is the most acidic.

b.Error, will dissolve, SiO2+4HF=SIF4 +2H2O CThat's right.

d.Error, the resulting precipitate is Al(OH)3, Fe(OH)3 and Mg(OH)2, and Al(OH)3 is insoluble in ammonia.