How to understand that ions cannot react in solution

The first is that no hydrolysis reactions, such as ferric chloride, take place.

Since iron ions are easily hydrolyzed, they can be hydrolyzed in water.

It does not undergo redox reaction with other present ionic gases.

or metathesis reactions.

If copper chloride is added to the alkaline solution, the metathesis reaction will occur, Cu2++2OH-=Cu(OH)2 (precipitation).

Ions exist in water as hydrated ions, and there are no covalent bonds with each other, and the ionic bonds are also broken by water. The ions are mainly electrostatic interactions, so no new chemicals are formed, which means that the ions do not react in solution. In fact, many chemical reactions are done by ions in solution, and the formulation of this problem is problematic.

Gases, solids, and liquids can all be used as solutes;

There can be multiple solutes in a solution, but only one solvent;

Water is a commonly used solvent, in addition to water, alcohol and gasoline can also be used as solvents;

The solute is present in the solvent in the form of molecules or ions so it is wrong, so D is chosen

For the vast majority of inorganic reactions, ionic reactions must be chemical reactions.

Not necessarily for organic reactions. Counter-examples are not easy to give examples, such as the solution polymerization of methacrylic acid (to produce plexiglass), which is a free radical polymerization reaction, and there are no ions in the reaction, which is a non-ionic reaction. All free radical reactions in aqueous solutions, including some inorganic organic photochemical reactions, are not ionic reactions.

Hope it helps

Maybe the landlord's problem is that the ionic reaction does not change the substance, but the reaction of ions combining with each other, why is it called a chemical reaction. Because if an ionic reaction occurs, such as ion precipitation, a gas is produced. In which the electronic structure of the atom changes, it is called a chemical reaction.

This is called the creation of new matter. It's time to get off work. I won't go into specifics.

The ionic reaction needs to be reacted in a liquid state or colloid, and the solid-liquid reaction can be an ionic reaction, such as fe + 2fecl3 = 3fecl2, the ion equation fe + 2fe3+ = 3fe2+, and the solid-solid heating reaction is generally not an ionic reaction, and the general ionic equation can be written as an ionic reaction.

Some ionic reactions do not see the phenomenon, but it is an ionic reaction, such as NaOH + HCl = NaCl + H2O, there is no phenomenon, the ion equation is oh- +H+ = H2O, which is essentially the combination of hydroxide and hydrogen ions to form water.

The ion equation reflects the essence of a reaction, and NaCl and Ba(OH)2 do not react, let alone ionic reactions.

Not necessarily, as long as an ionic reaction occurs, a few conditions are met.

1. If metadecomposition occurs, the product must have gas, precipitation or water.

2. In the event of a redox reaction, the reactants must be strong oxidizing and strongly reducing substance reactions.

3. If the complexation reaction occurs, complex ions must be generated.

4. If the double hydrolysis reaction occurs, gas or precipitation will be generated.

Therefore, it is good to meet the above conditions, and the solution colloidal Shenma is ......It's not a ...... to decide== Why can't you see the phenomenon is not the ionic reaction, if it is a strong oxidizing and reducing reaction, you may not see anything.

Substance......It should be ......By definition, ionic reactions are reactions between ions (- nonsense......）

I don't know the essence, anyway, you can see that it meets any of the 4 reaction conditions.

As for NaCl and Ba(OH)2, I think = = They didn't even have a chemical reaction and talked about Shenma ions or not!

The ionic reaction is a reaction of ions in the solution of Jaykai.

Redox reaction is a reaction in which electrons are transferred and valency changes.

An ionic reaction may or may not be a redox reaction.

For example, Fe+Cu2+==Cu+Fe2+, which is a resonant reaction and a redox reaction.

Ba2+SO42-==BaSO4 is an ionic reaction but not an ionic reaction.

Redox reactions may or may not be ionic.

For example, 2Al6H3H2 2Al3+ is a redox reaction and also an ionic reaction.

2H2O==2H2+O2 (electrolysis) is a redox reaction but not an ionic reaction.

The first question: the answer is not necessarily.

Ionic reaction refers to the slow operation of chemical reactions with ion participation or ion generation, and its conditions are usually in aqueous solution, and some occur in a molten state; Its essence is a change in the concentration of ions in the reaction system (usually in an aqueous solution), which is embodied in the formation of precipitation, gas, water, or weak electrolytes. Therefore, the two substances of the ionic reaction do not necessarily have to be dissolved in water, such as the ionic reaction of insoluble carbonate (such as calcium carbonate, barium carbonate, etc.) and hydrochloric acid.

Second question:

In option A, when potassium oxide is dissolved in water, it first reacts quietly with water to form potassium hydroxide, while KOH can react with acids and some salts (such as CuSO4), but cannot react with alkalis.

Option B cannot be reversed with alkali salts, which should be because in the metathesis reaction, the premise of salt and alkali, salt and salt reaction is that the reactants can be dissolved in water, and in option D, CO2 is passed into water to react to form carbonic acid, which cannot react with acid.

To sum up, the answer should be option C.

Does it have to be a reaction in an aqueous solution to be an ionic reaction?

A: High school chemistry is like this.

Can a reaction with only ions in the product be an ionic reaction?

A: Yes, for example, the reaction of copper and concentrated sulfuric acid to produce the reaction of copper sulfate, sulfur dioxide and water, but the product contains Cu2+ and SO42-

For example, the reaction 2kClO3==2kCl+3O2 is not carried out in an aqueous solution, but a new ion Cl- is it an ionic reaction?

Answer: This reaction is not an ionic reaction, the product of this reaction is a solid, there is no Cl- and K+, and the reactant Kclo3 is also a solid.

a. The ionic reaction of the solid state does not write the ion equation, so A is wrong; b. Only the ionic reaction that occurs in the aqueous solution can be written as an ionic equation, so b is correct; c. The ion concentration in the solution with strong conductivity is large, the strong electrolyte solution is completely ionized, and the weak electrolyte is partially ionized, even if it is a concentrated solution, the conductivity is not necessarily strong, so C is wrong; d. In the redox reaction, the oxidant is reduced to produce a reduction reaction, so D is wrong; Therefore, choose B