How to tell if a substance is salt and how to tell if a substance is salt

See if the substance is made up of acid ions and metal ions.

1. The non-aqueous substances prepared by acid-base reaction are salts if they can be prepared.

2. Salt needs to have acid ions and metal cations or ammonium ions.

3. The one that can ionize ions in the molten state is salt.

Salts refer to a class of compounds in which metal ions or ammonium ions are combined with acid ions or non-metal ions. Such as sodium chloride, calcium nitrate, ferrous sulfate and ammonium acetate, calcium sulfate, copper chloride, sodium acetate, etc.

1. To verify whether a substance is salt, it depends on the composition, and the salt needs to have acid ions and metal cations or ammonium ions.

2. The one that can ionize ions in the molten state is salt.

3. Judge whether the substance is a non-aqueous substance prepared by acid-base reaction, and if it can be prepared, it means that it is salt.

4. Salt refers to a class of compounds in which metal ions or ammonium ions are combined with acid ions or non-metal ions. Such as sodium chloride, calcium nitrate, ferrous sulfate and ammonium acetate, etc., such as calcium sulfate, copper chloride, sodium acetate.

5. Salt is the product of metathesis reaction, salt and salt reaction to form new salt and new salt, salt and alkali reaction to form new salt and new alkali, salt and acid reaction to form new salt and new acid, such as sulfuric acid and sodium hydroxide to produce sodium sulfate and water, sodium chloride and silver nitrate reaction to form silver chloride and sodium nitrate, etc. There are also other reactions that can produce salts, such as displacement reactions. The solution of soluble salts is conductive because there are ions that swim freely in the solution, so they can be used as electrolytes.

6. Salts in chemistry are divided into single salts and combined salts, single salts are divided into normal salts, acid salts, and basic salts, and combined salts are divided into double salts and complex salts. In the salt generated by the complete neutralization of acid and alkali, there will be no hydrogen ions in the acid or hydroxide ions in the base, only metal cations and acid ions, and the neutral salt is the normal salt.

Try ...... this understanding

If you don't know the molecular formula of this salt, it can be understood that salt is made up of acid plus a base, the product of the reaction, and the other product is water.

If you understand it from the molecular formula, then think so-

Acid, which is composed of H+, and the other half, that is, acid ions;

The base is made up of oh-, and the other half, that is, the metal ion;

Salt, on the other hand, is made up of their other half.

The corresponding arithmetic base can be directly deduced from the molecular formula of the salt.

For example, Cu2, Na2 is a metal cation, and SO4 2- and NO3- are acid ions.

The compound SALI-, which consists of metal ions (or ammonium ions NH4+) and acid ions; lalin-;salini-;salino-〗

Salts containing hydrogen ions are called acid salts, such as: ammonium bicarbonate (NH4HCO3); Sodium bisulfate (NaHSO4); Potassium monobasic phosphate.

kh2po4)

Salts containing hydroxide ions are called basic salts, such as: basic copper carbonate (Cu2 OH 2CO3) salts that do not contain hydroxide ions and hydrogen ions are called normal salts, such as: sodium chloride.

nacl);Sodium carbonate.

na2co3).In addition, there are double salts (such as alum) and so on.

Salt comes from chemistry and refers to a class.

Self-metal ions or ammonium ions

NH4+) compounds that bind to DU acid ions or non-gold ions. DAO salts are divided into single salts and combined salts, single salts are divided into normal salts, acid salts, and alkaline salts, and synthetic salts are divided into double salts and complex salts. Among them, the acid salt contains hydrogen ions in addition to metal ions and acid ions, and the basic salt contains hydroxide ions in addition to metal ions and acid ions. When complex salts are dissolved in water, complex salt complexes of complex ions that are different from the original salts can be generated.

If you don't understand, please ask, thank you.

Table salt and industrial salt.

Identification methods:

1.The two salts are dissolved separately, and silver nitrate is dropped, and there is a precipitation in the edible salt, and no precipitation is the industrial salt, and the chemical volume equation is: agno3 + nacl = agcl + nano3

2.Take a small amount of the solution of the two salts, add dilute hydrochloric acid and starch potassium iodide solution respectively (add two solutions at the same time), the one that turns blue is industrial salt, and the one that does not change color is table salt.

3.Take a small amount of the solution of the two salts, add dilute hydrochloric acid and potassium permanganate solution respectively (add two solutions at the same time), the purple solution can fade the industrial salt, and the non-fading one is table salt.

The difference between table salt and bai industrial salt.

1.structurally du

Table salt is relatively pure sodium chloride, and the chemical formula of sodium chloride is the version of NaCl, the formula quantity, which is composed of chloride ions and sodium ions. In addition to sodium chloride, there is also sodium nitrite that exceeds the standard, and its chemical formula is nano2, and the formula is composed of nitrite ions and sodium ions.

2.Properties: The nature of salt is relatively stable, and the aqueous solution is neutral. Sodium nitrite is relatively stable under dry conditions, but it can slowly absorb oxygen and oxidize to sodium nitrate, and the aqueous solution is alkaline.

3.Appearance: Both are white, and in special cases, table salt may also appear yellow or light blue, and sodium nitrite may also appear slightly yellowish. Both are crystalline and have a certain difference in geometry under the microscope, but they are not distinguishable with the naked eye.

4.Solubility: Sodium nitrite and table salt are very soluble in water, easy to deliquescent, and odorless.

5.Taste: Sodium nitrite is slightly salty, and table salt has a strong salty taste, which is difficult to distinguish by taste when eating.

From the above comparison, it can be seen that sodium nitrite is similar to salt in appearance and taste, and is easy to cause accidental ingestion poisoning.

Mild poisoning is generally not required, and more serious cases should be sent to the hospital immediately. The main ** measures are:1

Induce vomiting, gastric lavage, and induce vomiting. 2.The use of antidote methylene blue (melan) and vitamins has a certain effect on eliminating methemoglobinosis.

3.High doses of vitamin C and glucose are given.

Sodium nitrite (industrial salt) The relatively concentrated aqueous solution is generally yellow and transparent, with a small amount of foam (this is determined by the industrial manufacturing method) Salt The water-soluble solution is generally clear and transparent - practical experience in production The ...... cannot be distinguished with starch-potassium iodide test stripsNeither aqueous solutions of sodium nitrite nor sodium chloride can make it blue (unless it is an acidic solution of sodium nitrite), and ...... cannot be identified with pH test paperAt least the phenomenon is not obvious......Because it's all between 7-8.

The melting point of the salt is 271, and the melting point of the industrial salt is 271, and the first to melt is the industry. It may be that table salt does not melt on the alcohol lamp, but it can be identified. I think a better way is to add a silver nitrate solution to their aqueous solution, and the white precipitate is table salt.