How to talk about the conditions under which an ionic reaction occurs?

According to the reaction principle, ionic reaction can be divided into four types: metathesis, salt hydrolysis, redox and complexation.

The conditions under which the ionic reaction takes place.

Conditions for metabolic ionic reactions.

The conditions for ionic reactions such as ion reactors are the same as those for metathesis reactions, and there are three situations: (1) the formation of insoluble substances.

Common (2) Substances that are difficult to ionize are generated.

Common substances that are difficult to ionize.

Ionic reaction reaction law: from strong acid to weak acid, from strong base to weak base. Such as:

Hydrochloric acid Ca(clo)2 solution Hclo HCo

dilute acetic acid, sodium phenol solution, ch3cooh, c6h5o, ch3coo, c6h5oh

NH4Cl solution, NaOH solution, NH4 OH, NH3·H2O

3) Formation of volatile substances.

Common volatile substances are: SO2, CO2, NH3, H2S, etc.

Ionic reactions in which SO2, CO2, and NH3 are volatile substances and refractory to ionization (H2SO3, H2CO3,

NH3·H2O) is a product of further decomposition, so that the essence of the reaction from the ions is the same.

Some ionic reactions are not carried out under ionized conditions of the electrolyte and cannot be expressed by ionic equations. Such as:

Laboratory NH3 with solid ammonium salt reaction with solid Ca(OH)2:

The insoluble substances are:

Ionic reaction When the concentration of the relevant ions is large enough, the reaction to form microsolutes can also occur, and the common microsolutes are CaSO4, AG2SO4, MGCo3, Ca(OH)2, etc.

Such as: CA2 SO42 CASO4

Reactions to produce insoluble substances from microlysols can also occur, such as:

ca(oh)2＋co32－＝caco3↓＋2oh－

Slightly soluble) (poorly soluble).

caso4＋co32－＝caco3↓＋so42－

Slightly soluble) (poorly soluble).

Ionic reaction Laboratory HCl, HF, HNO3 with concentrated sulfuric acid reaction with their salts:

Ionic reaction But the reaction of Cu with concentrated H2SO4 is not an ionic reaction.

Conditions for redox reactions with ion participation.

Some ionic reactions in solution occur due to redox reactions, which reduce the concentration of certain ions of the reactants. Whether such reactions can occur depends on the oxidation and reducing strength of the ions, and the principle of changing from strong to weak must be satisfied, that is, substances with weak oxidizing and reducing properties are generated from the properties of strong oxidation and reduction. It mainly includes the displacement reaction with the participation of ions and the redox reaction with the participation of other ions.

Such as: ionic reactions. Other ionic reactions, such as the hydrolysis of salts, complexation reactions, can occur under the condition that some ions of the reactants combine into substances that are difficult to ionize, resulting in a decrease in the concentration of reactant ions.

The ionic reaction reduces the concentration of ions in the solution.

The main manifestations are as follows:

1) There is gas discharged.

2) Weak electrolyte formation.

3) There is precipitation generated.

1) There is gas discharged.

2) Weak electrolyte formation.

3) There is precipitation generated.

4. Redox reaction can occur.

5. Complexes can be generated.

1.Insoluble matter (precipitate) is generated

2.Formation of difficult-to-ionize substances (e.g., water, weak acids. weak base).

3.Vent the gas.

The following ** is pretty much the same as I said, so it's very well-founded, believe me In addition, the essence of the reaction is that the concentration of ions decreases.

1. There is gas generated.

2. There is weak electrolyte production (water, weak acid, weak base).

3. There is precipitation generation, and these are relatively basic.

The conditions for the ion reaction to occur are: the formation of insoluble substances, the formation of substances that are difficult to ionize, and the formation of volatile substances.

Ion reaction writing steps.

"One write": First, write the chemical equation of the reaction based on objective facts.

"Second change": rewrite the soluble and ionized substances into ionic form (the most critical step).

"Three deletions": delete the ions on both sides of the equation that do not participate in the reaction.

"Four checks": check whether the number of atoms and the total number of charges of each element on both sides of the ion equation are equal.

The concept of ionic reactions.

When the electrolyte is dissolved in water, it ionizes into free-moving ions. Therefore, the reaction of the electrolyte in the solution must be ion-related. The reaction of electrolyte in solution is essentially a reaction between ions, and such a reaction is an ionic reaction.

The essence of an ionic reaction is a change in the concentration of certain ions. Common ionic reactions are mostly carried out in aqueous solutions. It is a chemical reaction with the participation of ions.

According to the reaction principle, ionic reaction can be divided into four types: metathesis, salt hydrolysis, redox and complexation. It can also be divided into interion, ion-molecule, ion-atom and atom reactions according to the particles participating in the reaction.

When an extremely concentrated electrolyte reacts with a solid substance, it is necessary to determine whether it is an ionic reaction based on the nature of the reaction. For example, when concentrated sulfuric acid reacts with copper, it shows the oxidation of sulfuric acid molecules, so it is not an ionic reaction; When concentrated sulfuric acid reacts with solid sodium sulfite, it is actually the interaction between hydrogen ions and sulfite ions, which is an ionic reaction. In addition, ionic compounds can also undergo ionic reactions in the molten state.

1. Generate insoluble substances. For example, BaSO4, AGCL, CaCO3, etc. are generated.

2. Generate substances that are difficult to ionize. For example, CH3Cooh, H2O, NH3·H2O, HCl, etc. are generated.

3) Formation of volatile substances. Such as the generation of CO2, SO2, H2S, etc.

As long as one of the above three conditions is present, the ion exchange reaction can take place. This is due to the fact that when the interaction between ions in the solution produces insoluble substances, difficult ionization substances, and volatile substances, the concentration of certain freely moving ions in the solution can be reduced.

In the solution there are ions that participate in the reaction of fire ion generation.

Note that as long as there is an electrolyte in dissolution.

The reaction is ionic and not all reactants that participate in the ionic reaction are electrolytes.

1. There is gas generated.

2. There is weak electrolyte production (water, weak acid, weak base).

3. There is precipitation generation.

One of the following conditions is sufficient:

Precipitate gases. Water redox.

1. Generate insoluble substances.

2. Generate hard-to-ionize substances.

3. Generate gas.

Satisfy one of them.

Because any of these three conditions can reduce the concentration of certain ions in the solution (ions combine into insoluble substances, other, refractory ionizing substances), the metathesis reaction in solution always proceeds in the direction of decreasing the concentration of certain ions in the solution.

It can be said that because some ions in the solution have combined into insoluble substances, other and difficult to ionize substances, it means that the reaction has occurred. Otherwise, the ions in the solution are still ions, and the metathesis reaction does not take place if there is no change.

First, the ionic reaction must take place in an aqueous solution. The second is that at least one of the two sides of the reaction in the ionic reaction can ionize the ions.

The condition of an ionic reaction is that there are ions participating in a chemical reaction. The essence of an ionic reaction is a change in the concentration of certain ions. Common ionic reactions are mostly carried out in aqueous solutions.

In addition, ionic compounds can also undergo ionic reactions in the molten state. It is important to note that concentrated sulfuric acid cannot be disassembled into ionic form.

Metathesis reactive type:

1.Formation of insoluble matter (i.e., precipitate).

2.Formation of refractory ionization (weak acid, weak base, or water).

3.Volatile substances (i.e. gases) are generated

Redox reactive type:

Ions are present or ion-generated.

Formation of insoluble matter or gas or water or weak electrolyte.

Ionic reactions can also occur in the molten state.

The conditions under which the ion reaction occurs are described in detail as follows:

1. The Encounter of Ions:

The first condition of an ionic reaction is the meeting of the ions, and the ionic reaction can only occur if the ions are close to each other, in a solution, the ions are close to each other by diffusion and collision, etc., however, even if the ions meet, the reaction does not necessarily occur, and other conditions need to be met.

2. Activation energy:

The second condition of ionic reaction is to have sufficient activation energy, activation energy refers to the energy required for the reaction to occur, in ionic reaction, the ion needs to overcome interaction forces such as attraction and coulomb repulsion in order to have an effective collision and reaction. If the activation energy of the ions is not high enough, the reaction is difficult to take place.

3. Concentration of reactants:

The third condition of ionic reaction is the appropriate concentration of reactants, the higher the concentration of reactants, the greater the probability of collision between ions, thus increasing the probability of reaction occurrence. When the concentration of reactants is too low, the frequency of collisions between ions is low, the reaction rate is slow, or even the reaction cannot occur.

Fourth, the reaction environment:

The fourth condition of ionic reaction is the suitable reaction environment, which includes factors such as temperature and solvent. In some ionic reactions, the increase in temperature can increase the average kinetic energy of the reactant molecules, increase the frequency of collisions between ions, and thus facilitate the reaction. The choice of solvent may also have an impact on the ionic reaction, as the solvent can provide a medium to dissolve the ions and regulate the ion concentration and reaction rate.

Fifth, the promotion of anti-demolition should:

The increase of reactant concentration can increase the frequency of collision between ions, promote the progress of the reaction, and the appropriate reaction environment also plays an important role in the occurrence of ionic reactions.

6. Summary:

The conditions for ionic reactions to occur include the encounter of ions, sufficient activation energy, suitable reactant concentration, and suitable reaction environment. The ions need to be close to each other to react, and at the same time, they need to have enough activation energy to overcome the interaction forces and have an effective collision.