What is salt in chemistry and what is the concept of salt in chemistry

Compounds that produce metal ions and acid ions when ionized are called salts. Such as NaCl, KNO3, Al2(SO4).

Salt generality: some salts are weakly corrosive, and the pH of the solution is judged according to the properties of the salt, which can react with certain acids, alkalis, salts, and other compounds.

Properties of salt Salt + Acid - (see Properties of Acid).

Salt + alkali - (see properties of alkali).

Salt + salt = new salt + new salt Reaction conditions: Salt must be soluble in water and there is precipitation in the product Reaction type: metathesis.

Example: CuSO4 (salt) + BA(OH)2 (salt) = Cu(OH)2 (new salt) + BASO4 (new salt).

This is a double precipitate reaction, and of course only one precipitate is fine.

Salt + a metal = new salt + new metal Reaction conditions: salt is soluble and the activity of the metal is greater than that in salt Reaction type: metathesis.

Example: CuSO4 (salt) + Fe (metal) = FeSO4 (new salt) + Cu (new metal).

But there are some metals that cannot achieve this reaction, i.e. with the exception of potassium, calcium and sodium, because they react with water.

Acidic oxides: acidic substances (generally non-metallic oxides) that are dissolved in water

For example, CO2 is carbonic acid when dissolved in water, and carbonic acid is acidic, so CO2 is an acidic oxide.

Basic oxides: Similar to the above, they are alkaline substances (usually metal oxides) when hydrated

For example, after CAO is dissolved in water, the solution is alkaline, so CAO is a basic oxide.

Salt: Ionized in solution (or in a molten state) with both anions and cations, is salt. (You can remember that in inorganic substances, in addition to acids and bases, oxides, are salts).

For example, naHCO3, usually baking soda, it is a salt, and it is an acid salt, it has bicarbonate ions: HCO3-

There are metal ions and acid ions in the chemical formula of salts.

It is important to note that there should be.

Acid ions, such as Cl-, NO3-, SO42-, PO43-, etc.

For example, CAO, although it has metal ions, it has no acid roots, so it is not a salt, it is an oxide.

In chemistry, a substance composed of metal ions and acid groups is called salt.

Such as NaCl KCL ...

HCL is an acid, so chlorine is an acid root, so NaCl is a salt!

It is a compound composed of acid ions and metal 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 phosphate monobasic (KH2PO4).

Salts containing hydroxide ions are called basic salts, such as basic copper carbonate (Cu2OH2CO3).

Salts that do not contain hydroxide ions and hydrogen ions are called positive salts, such as: sodium chloride (NaCl); Sodium carbonate (Na2CO3).In addition, there are double salts (such as alum) and so on.

1. 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, ammonium acetate, calcium sulfate, copper chloride and sodium acetate, etc.

2. Positive salt is composed of metal ions and non-metal ions, acid salt: composed of metal ions, hydrogen ions, acid ions and non-metal ions, basic salt is composed of metal ions, hydroxide ions, acid ions and non-metal ions, and double salts are composed of different metal ions and acid base cavity to escape coarse rocks, and the above metal ions include ammonium ions.

3. Generally speaking, 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.

Hydrochloric acid is not only an important product of salt chemical industry, but also an important raw material for the production of silicon materials.

Sodium chloride, the main ingredient of the salt.

Salts are compounds that produce metal ion bureds and acid ions when ionized. Such as NaCl, KNO3, Al2(SO4).

The general properties of salt: some salts are weakly corrosive, and the pH of the solution is judged according to the nature of the salt, which can react with certain acids, alkalis, salts, and can also react with some other compounds The properties of salt + acid - (see the properties of acids) Salt + alkali - (see the properties of alkali) Salt + arc staring gang in the old field of the Gang Frost Gongyan salt = new salt + new salt Reaction conditions: salt must be soluble in water and there is precipitation in the product Reaction type:

Metathesis Example: CuSO4 (salt) + BA(OH)2 (salt) = Cu(OH)2 (new salt) + BASO4 (new salt) This is a double precipitated reaction, of course, only one precipitate is OK Salt + a certain metal = new salt + new metal Reaction conditions: salt is soluble and the activity of the metal is greater than that in salt Reaction type:

Metathesis Example: CuSO4 (salt) + Fe (metal) = FeSO4 (new salt) + Cu (new metal).

But some metals cannot achieve this reaction, that is, except for potassium, calcium and sodium, because they react with water Acidic oxides: acidic substances (generally non-metallic oxides) after dissolving in water Example: CO2 is carbonic acid after dissolving in water, and carbonic acid is acidic, so CO2 is an acidic oxide Alkaline oxide: similar to the above, it is an alkaline substance (generally a metal oxide) after hydration) Example:

After CaO is dissolved in water, the solution is alkaline, so CaO is a basic oxide.

The chemical name of salt is sodium chloride.

But in fact, it is not only sodium chloride that can be eaten, potassium chloride is also edible. In chemistry, salt refers to a class of metal ions or ammonium ions combined with acid ions, such as calcium sulfate, copper chloride, sodium acetate, generally speaking, salt is the product of metathesis reaction, such as sulfuric acid and sodium hydroxide to produce sodium sulfate and water, there are also other reactions to produce salts, such as displacement reactions.

Types of single salts:

1. Basic salt.

Basic salts are a type of salt, which contains hydroxide or oxygen ions in addition to metal ions and acid ions; It can also be considered as a product of the hydroxide of the base that is not completely neutralized by the acid. Basic salts containing hydroxyl groups are also known as hydroxyl salts, which can be regarded as salts synthesized by metal ions, hydroxides and anions, such as basic copper carbonate and basic magnesium chloride as hydroxyl salts.

The basic salts containing oxygens are called oxide salts, which can be regarded as salts synthesized by metal ions, oxygen ions and anions, such as basic bismuth carbonate oxide salts.

2. Positive salt. Positive salts are a type of salt that contains neither ionized hydrogen ions nor hydroxide ions. The positive salt is the product of complete neutralization of acid and alkali, but the aqueous solution of the normal salt is not necessarily neutral, such as the solution is alkaline and the solution is acidic.

In the salt formed by the complete neutralization of acid and alkali, there will be no hydrogen ions in the acid, and there will be no hydroxide ions in the base, only metal cations and acid ions, such salts are positive salts, and the reaction of generating positive salts is generated.

3. Acid salt.

Acid salts are a type of salt that consists of cations and incomplete anions of polyacids. Because anions contain hydrogen atoms that can be ionized in water, they are called acid salts. However, in fact, only strong acids and a small number of acid salts with strong acids are acidic, and most of the acid salts of weak acids are alkaline due to the hydrolysis of anions.

It should be noted that when the acid salt is present in the form of ionic crystals, the anion does not ionize hydrogen ions, which are part of the acid acid ions. In the molten state, the acid root is not ionized from Luzi. <>

In chemistry, salt refers to a class of metal ions or ammonium ions (NH+) combined with acid ions of compounds, such as calcium sulfate, copper chloride, sodium acetate, generally speaking, salt is the product of metathesis reaction, such as sulfuric acid and sodium hydroxide to produce sodium sulfate and water, there are also other reactions to form salts, such as displacement reactions.

The color of the salt can be pure and transparent (e.g., sodium chloride), opaque, or metallic (e.g., pyrite). In most cases, the transparency or opacity of the salt surface is only related to the single crystals that make up the salt. When light hits the salt, it is reflected back by grain boundaries (the boundary between crystals), and large crystals appear transparent, while polycrystals clumped together look more like white powder.

Strong acids or alkaline salts (strong salts) are non-volatile and odorless. Weak acids or alkaline salts (weak salts) produce different odors depending on the conjugated acid-base pair. In addition, weak acids or weak alkali salts volatilize and decompose, and since the hydrolysis reaction and the reaction of weak salt synthesis are reversible reactions, the decomposition of weak salts will be accelerated when water is present.

Chemically, salts are neutral (uncharged) ionic compounds composed of cations (positively charged ions) and anions (negatively charged ions). and acids. Metathesis reaction. Acid + Salt New Salt + New Acid (Strong Acid, Weak Acid) The salt here can be insoluble salt.