What is ion coexistence? What does ion coexistence mean

They do not react with each other in solution.

The so-called ion coexistence is essentially a matter of judging whether there is a reaction between ions. If a reaction can occur in solution, it cannot coexist in large quantities. Judging whether the reaction can occur is not only the generation of precipitation, gas, water, and substances that are difficult to ionize, but also involves the acidity, alkalinity, colorlessness, and colorlessness of the solution, and whether it can be redox and anti-slip to know the response.

The ion reaction is carried out in the direction of ion weakening, and ion coexistence essentially refers to whether ions can have a chemical reaction, and if ions cannot react with each other, they can coexist. It is believed that reflex cancellation cannot coexist if the ions in the solution can react with each other. There are many factors that need to be considered for the reaction between ions, such as:

Whether there are volatile substances generated, insoluble substances formed, weak electrolytes formed between ions in the solution, etc.

Ion coexistence means that the given ions can co-exist and still maintain their original chemical properties without reacting with each other.

This means that there are no chemical reactions between different ions, such as precipitation, gas formation, and so on

Ion coexistence means that ions do not combine into precipitates or gases or water, and can coexist peacefully in solution; For example, sodium, potassium, and nitrate can coexist with a variety of ions.

The so-called ion coexistence means that there is no chemical reaction between ions to produce water that is difficult to ionize. The gas and the precipitated can coexist, otherwise they can't. For example:

Hydrogen ions and hydroxide ions. Carbonate ions. Bicarbonate ions. Sulfur ions. Sulfite ions cannot coexist. It reacts separately to form water. carbon dioxide and water. Hydrogen sulfide gas. Sulphur dioxide gas and water.

Hydroxide ions vs. hydrogen ions. Copper ions. Iron ions. Ferrous ions. Magnesium ions. Aluminium ions. Zinc ions. Silver ions. Ammonium ions, etc., cannot coexist. It reacts to produce water. various precipitation and ammonia.

Sulfate and barium ions. Silver ions cannot coexist.

Chloride ions cannot coexist with silver ions.

Carbonate ions can only be compared to sodium. Potassium and ammonium ions can coexist.

Ion coexistence means that the given ions can appear stably in the same solution without reacting.

Ag+ and Cl- can not coexist because they precipitate: Ag++ Cl-

AGCL NO3- oxidizes Fe+ in acidic media, so they cannot coexist either:

3fe²+ 4h+

no3- 3fe³+

no↑ 2h2o

First of all, understand concept 1The so-called ion coexistence is essentially a question of whether there is a reaction between ions. If the reaction occurs in solution, it cannot coexist.

To see whether the reaction can occur, it is not only because of the precipitation, gas, water, and substances that are difficult to ionize, but also because the solution is acidic and alkaline, colored, colorless, and whether the redox reaction can be carried out.

2.The first principle: In a strong acidic solution, there can be no large number of weak acid ions: such as CO32, HCO3, S2, HS, SO32, SiO32-, AlO2, F, etc., nor can a large amount of OH be detected.

Since sodium bisulfate is a strong electrolyte, it is completely ionized, and the equation for ionization is: NaHSO4=Na+ H+ +SO4(2-) in water), that is, (H+ +SO4(2-)) is not allowed to be closed in the oil-containing SO3 2- in violation of the first principle.

Here is the link, you can figure it out, know a few coexistence principles, and the problem of ion coexistence in the high school range is not a problem for you.

Can't coexist.

Sodium hydrogen sulfur ionizes hydrogen ions.

Hydrogen ions and sulfite ions do not coexist to form sulfur dioxide.

If you don't understand, you can ask me again.

1. It is not possible to generate precipitation.

2. The generation of gas does not believe that it can be withered.

3。Weak electrolytes cannot be generated.

4。Weak shouqingate and H+ are not allowed to be tamable (or acidic environment), and weak alkali ions are not allowed with OH-; Weakly acidic roots and H+, OH- are not available.

5。When the title indicates that the colorless solution, the colored ions are not allowed.

That's probably it, you'll have to master it.

Under the following conditions, the ion group that must be able to coexist in large quantities is ( ).

a;Colorless and transparent aqueous solution: K+, Mg2+, I-, MnO4-

Wrong mno4 - colored. Purple.

b;pH = 1 in nano3 aqueous solution: NH4+, Fe2+, SO4(2-), Cl-

Wrong matter Qing pH=1 Strong acidity At this time, NO3- has strong oxidizing properties, and Fe2+ will be oxidized.

c;C(HCO3-)=Stimulus in solution: Na+, K+, CO3(2-), Br-

OK. d;C(OH)-=1 10-14mol L in solution, H+, Al3+, NO3-, Cl-, produced by the ionization of the lead grip in the water hood

C(OH)-=1 10 -14mol l strong acid or base produced by water ionization.

And the title says that there must be coexistence, so both of these must be satisfied. When it is strongly alkaline, it has H+ and cannot coexist. c】

Ca colorless transparent aqueous solution in mNO4-colored.

b;In the aqueous solution of nano3 with pH = 1, there are H+ and NO3-, which cannot coexist with Fe2+.

d produced by water ionization c(oh)-=1 10 -14mol l in the solution zone acre.

The ionization of water c(oh-)=10 -14mol l, indicating that the ionization of water is inhibited, and the substance that inhibits the ionization of water is acid or alkali, so the solution may be acidic or alkaline.

H+, Al3+, No3-, Cl- do not coexist in alkaline (H+).

The permanganate in a has a talking color.

b is acidic, nitrate is made of strong oxidizing iron, and ferric iron can not be stored in the fiber.

d is strongly acidic or strongly alkaline H+, Al3+ is not the same as the socks must exist.

The answer is c