Why does ammonia provide hydrogen ions? Thank you

First of all, in university organic chemistry, for all nucleophilic substitution reactions in which NH3 participates, the attacking group is NH3 instead of NH2-, unless the use of sodium aminos is emphasized.

Let's take the reaction of ethyl bromide and ammonia to ethylamine to illustrate, the reaction is an SN2 reaction, first the carbon of ammonia and ethyl bromide forms a transition state [H3N---CH2BRch3], then the lone pair of ammonia is transferred to carbon to form N-C bonds, and the electrons of C-BR bonds are transferred to BR to form bromine ions, at this time a CH3CH2NH3+ is formed, and then neutralized with dilute alkali solution to obtain ethylamine. Other nucleophilic reactions involved in NH3, such as aminolysis of acid chloride and aminolysis of alcohols, are similar mechanisms.

Of course, there are also nucleophilic reactions involving amino aniions, but the reagents generally used are sodium aminos, such as p-nitrochlorobenzene and amino groups undergo a relimination-addition mechanism reaction, and p-nitroaniline is obtained through a phenylyne intermediate. Of course, this reaction can also be reacted with ammonia, but the activity is relatively poor, and the mechanism of the reaction with sodium aminois is different from that of an addition-elimination reaction.

Water is a weak electrolyte that ionizes hydrogen ions and hydroxide ions. Ammonium ions are easy to combine with hydroxide to synthesize, and excess hydrogen ions appear in the water, so they are acidic.

This is a hydrolysis problem and can be explained more appropriately from the textbook.

When one of the N-H bonds breaks, it provides a free H ion that is usually produced under special circumstances.

Both ammonia (NH3) and copper amino-ion (Cu(NH3)4 2+) can give hydrogen ions (H+), but the ability of ammonia-copper ions is stronger.

Ammonia is an alkaline substance, which can accept a hydrogen ion in water to form ammonia ions (NH4+). The chemical equation for this reaction is as follows:

nh3 + h2o → nh4+ +oh-

Ammonia copper ion is a coordination complex of ammonium and copper ion (Cu2+). In water, the ammonia copper ions release four ammonia molecules, and the ammonia molecules can accept more hydrogen-bending ions to form ammonia ions. The chemical equation for this reaction is as follows:

cu(nh3)4^2+ +h2o → cu(nh3)4(h2o)^2+ +nh4+

Ammonia is alkaline and can be neutralized with hydrogen ions.

It is expressed by the ion equation as: NH3·H2O + H+ NH4+ +H2O (note that ammonia can also be written directly as NH3, so the product water can also be noted; Here I write it as ammonia monohydrate).

The chemical equation needs to correspond to what kind of substance ionized hydrogen ions are obtained, and I take dilute hydrochloric acid as an example

nh3·h2o + hcl →nh4cl +h2o

1. Because there are h atoms in ammonia, n atoms with large electronegativity, and lone pairs of electrons on n, it has the conditions for the formation of hydrogen bonds.

2. Under liquid conditions, ammonia has a close distance between molecules and can form hydrogen bonds.

3. Due to the best use of hydrogen bonding, liquid ammonia can be self-ionized like water to generate ammonium ions and amino anion ions, of course, the degree of ionization is relatively small, and it is reversible: 2NH3=NH4++NH2-

There must be that the n of one ammonia molecule forms a hydrogen bond with the h of another ammonia molecule.

Only the elements in No f have hydrogen bonds.

This statement is incorrect, there is no ion state H in ammonia water, it should be said that ammonia contains hydrogen, or contains hydroxide, which is a combination with other elements.

There is the following chemical equilibrium in ammonia:

NH3 + H2O = (reversible) = NH3·H2O

NH3·H2O= (reversible) = NH4+ +OH- where OH- is hydroxide (negative ion).

First of all, ammonia refers to the liquid formed by ammonia NH3 dissolved in water, ammonia NH3 has H ions, and water H2O also has H ions.

There are only three substances that have hydrogen bonds, hydrogen fluoride, water, and ammonia.

There are two substances in ammonia, one is water and the other is ammonia monohydrate, and there are hydrogen bonds between the water molecules.

There are also hydrogen bonds in two ammonia monohydrate molecules, and it is very simple to explain, ammonia monohydrate molecules are hydrates, which contain the structure of water molecules, and there are hydrogen bonds between water molecules, and there are naturally hydrogen bonds between ammonia monohydrate molecules.

So both.

The ionic equation for the introduction of a small amount of hydrogen sulfide into ammonia is:

Chemical equation for the introduction of a small amount of H2S into ammonia water:

H2S+2NH3·H2O=(NH4)2S+2H2O The ion equation for a small amount of H2S is introduced into ammonia water:

H2S+2NH3·H2O=2NH4+ +S2- +2H2O The chemical equation for excess H2S is introduced into ammonia water:

H2S + NH3·H2O = NH4HS + H2O The ion equation for excess H2S in ammonia water:

h2s+nh3·h2o=nh4+ +hs- +h2o

Ammonia does not count with.

Hydrogen ions. React. Because the way ammonia is present in the water is.

Ammonia monohydrate. Ammonia monohydrate is partially ionized in water:

nh3·h2o↔nh4+

oh-.The solution tends to be alkaline, and if there are hydrogen ions present, the hydrogen ions will neutralize this alkalinity, so the hydrogen ions will promote the ionization of ammonia monohydrate.

The draft is NH4+ and H2O

That's because of that.

There is H3O+ in it.

The essence is a neutralizing reaction.

First of all, you need to distinguish ammonia monohydrate.

Crystals, ammonia.

and ammonia.

Ammonia size finch water is formed when ammonia monohydrate crystals are dissolved in water (or ammonia is soluble in water).

Ammonia monohydrate crystals are made up of NH3-H2O molecules before they are dissolved in water. (Of course, ammonia is also made up of molecules).

Intermolecular bonds are formed by covalent bonding.

When ammonia monohydrate crystals dissolve in water, they are affected by water molecules.

The effect of early dissociation occurs, forming ammonium ions and hydroxide ions.

However, because ammonia is a weak base and is not completely dissociated in water, there are still undissociated ammonia monohydrate molecules and ammonia molecules in ammonia water.

Therefore, as "Zhou Ren Yili" said, ammonia contains water molecules, ammonia molecules, ammonia monohydrate molecules, ammonium ions, hydroxide ions and hydrogen ions (hydrogen ions are very small and produced by water ionization). To sum up, Makrobammonia water is composed of three molecules and three ions.

where NH3 (more) H2O (more) NH4+ (less) OH- (less) H+ (rarely) NH3·H2O

more). I hope you understand, and feel free to ask.