What are Acid Oxides? What are Basic Oxides?

Acidic oxides.

It is a class of oxides that can react with water to form acids or alkalis to form salts and water.

Since acidic oxides can also be regarded as products produced by acid dehydration, general acidic oxides are also called anhydrides.

The common ones are sulfur trioxide SO3Phosphorus pentoxide, manganese heptaoxide. chromium trioxide, CRO3, etc.

Basic oxides.

It is a class of oxides that can react with acid to form salt and water (note that the product can only be salt and water, and no other substances can be generated.)

For example: Na2O+2HCl==2NaCl+H2O (the reaction only produces salt and water, so Na2O is about the basic oxide of sodium).

2Na2O2+2H2SO4 (dilute) ==2Na2SO4+O2 +2H2O reacts to produce oxygen So Na2O2 is not called a basic oxide)).

Common ones include sodium oxide, Na2O, calcium oxide, BAO, CRO, MNO, etc.

Acid oxides are a class: acids that can react with water to form corresponding valences, or react with alkalis to form salts and water (and the products can only have one salt and water, and no other substances can be formed), or oxides that react with basic oxides to form salts, but generally do not react with normal salts or acid salts.

Basic oxides are oxides that react with water to produce only alkalis, or acids that react with acids to produce only salts and water (note the word "only"). Metal oxides are generally basic oxides, with exceptions, such as manganese heptaoxide and chromium trioxide.

Acid oxides are carbon dioxide, sulfur dioxide, acid oxides, etc.

Basic oxides include copper oxide, iron oxide, etc.

Acidic oxides are a class of oxides that react with alkalis to form only one type of salt and water. Most of the non-metallic oxides are acidic oxides, and the ** oxides of some transition elements (such as CRO3, Mn2O7, etc.) are also acidic oxides. Acidic oxides belong to anhydrides, for example, SO2 is called sulfur anhydride, SO3 is called sulfur anhydride, CO2 is called carbon anhydride, and acetic anhydride is an acid anhydride but not an acid oxide.

Basic oxides are oxides that are dissolved in water and only form one type of alkali or react with acids to form only salts and water. Basic oxides are all oxides of metal elements, their alkalinity varies greatly, some (such as sodium, calcium, magnesium oxides) are easily combined with hydration and can quickly and completely neutralize with all acids.

Acidic oxide universality.

1. Most of them can react with water to form corresponding acids (except for some oxides that cannot react with water, such as silica SiO2).

2. Reaction with alkali produces only one kind of salt and water.

3. Reaction with alkaline oxides.

Acid oxides are mainly non-metallic oxides, such as: SO2, SO3, CO2, N2O5, N2O3, P2O5, etc.

Basic oxides are all metal oxides, such as: Na2O, K2O, MGO, Fe2O3, CuO, CaO, etc.

Acid oxides are: carbon dioxide, sulfur dioxide, sulfur trioxide, silicon dioxide, phosphorus pentoxide, nitrous pentoxide, etc.

Basic oxides are: potassium oxide, calcium oxide, sodium oxide, barium oxide, magnesium oxide, ferric oxide, copper oxide, mercury oxide, silver oxide, etc.

Common acid oxides include carbon dioxide CO2, nitrous pentoxide N2O5, sulfur trioxide SO3, sulfur dioxide SO2, heptachlorohydride Cl2O7, silicon dioxide SiO2, etc., and the ** oxides of transition group elements are generally acidic oxides. CO, NO, etc. are not acidic oxides or alkaline oxides, but are not salt oxides, and water is a special oxide.

Other. 1. Most of the acidic oxides can be directly combined with water to form oxygenated acids.

CO2 + H2O = (reversible) H2CO3.

so3+h2o=h2so4。

SO2 + H2O = (reversible) H2SO3 (sulphurous acid).

2. Oxygenated acids can also be decomposed by heat to form acidic oxides. For example, sulphurous acid can be heated to obtain sulfur dioxide and water

h2so3=so2+h2o。

Here, sulphur dioxide can be seen as a product of sulphurous acid dehydration.

SiO2, N2O5, are also acidic oxides, but silica is insoluble in water and cannot be directly combined with water to form silicic acid.

3. The most important basis for judging acidic oxides is that the valency of each element remains unchanged before and after the chemical reaction.

4. It is composed of two elements, one of which is oxygen.

Difference Between Basic Oxides and Acidic Oxides

Acidic oxides are a class of oxides that can react with water to form acids or alkalis to form salts and water. Generally, it is the oxide of non-metallic elements and the **oxide of certain transition metal elements. For example, sulfur trioxide SO3, phosphorus pentoxide P2O5, manganese heptaoxide Mn2O7, chromium trioxide CRO3, etc.

The hydrate corresponding to the acidic oxide is an acid, for example, the hydrate corresponding to CO2 is H2CO3, and the hydrate corresponding to N2O5 is Hno3.

It reacts with acid to form salt and water, which is called alkaline oxide, and the product can only have salt and water, and no other substances can be generated. Basic oxides include active metal oxides and low-valent oxides of other metals such as Na2O, CAO, BAO and CRO and MNO.

The corresponding hydrate of basic oxides is alkali. For example, the hydrate corresponding to CaO2 is Ca(OH)2, and the hydrate corresponding to Fe2O3 is Fe(OH)3.

Alkaline oxides are relatively stable when heated and generally do not decompose. Basic oxides are all metal oxides, while metal oxides are not necessarily basic oxides, such as Mn2O7 is an acid oxide, and Al2O3 is an amphoteric oxide.

Oxidation reaction:

Oxidation is a chemical reaction between a substance and oxygen, in which oxygen is provided.

The chemical reaction between a substance and oxygen is a type of oxidation reaction; Oxygen can react chemically with many substances. The function of gaining electrons is called reduction. Oxidation in the narrow sense refers to the combination of substances and oxidation; Reduction refers to the action of a substance losing oxygen.

When organic matter reacts, the effect of introducing organic matter into oxygen or removing hydrogen is called oxidation; The action of introducing hydrogen or losing oxygen is called reduction. The oxidation of a substance that reacts slowly with oxygen and slowly heats up without emitting light is called slow oxidation, such as metal rust, biological respiration, etc.

1. Acid oxide is a kind of oxide that can react with water to form acid or alkali to form salt and water, but the bond bridge generally does not react with normal salt or acid salt. Alkaline oxides are a class of oxides that can react with acids to form salts and water (and the products can only have salt and water, and no other substances can be formed in Chenzhou.)

2. Oxides that can react with alkali to form salt and water are called acid oxides, and most of the non-metal oxides are acid oxides. Basic oxides are oxides that react with acids to form salts and water. It can react with acid to form salt and water, and this oxide is called basic oxide.

Basic oxides include active metal oxides and low-valent oxides of other metals, and the corresponding hydrate of basic oxides is alkali.

The method of judging acidic oxides and basic oxides is as follows:

Judgment of acid oxide: write the corresponding acid according to the non-metallic elements except oxygen, and then remove the water by 2:1 between the hydrogen atom and the oxygen atom, and the remaining acid oxide is the acid oxide.

Universality: Most of them can react with water to form corresponding acids (except for some oxides that cannot react with water, such as silica SiO2). Reacting with a base produces only one type of salt and water, which reacts with an alkaline oxide.

Judgment of basic oxide: write the corresponding base according to the metal element, and then remove the water by 2:1 of the hydrogen atom and the oxygen atom, and the remaining is the basic oxide.

Basic oxides include active metal oxides and low-valent oxides of other metals such as Na2O, CaO, BAO, and CRO. The corresponding hydrate of basic oxides is alkali. For example, the hydrate corresponding to CaO is Ca(OH)2 and the hydrate corresponding to Na2O is NaOH.

However, if the corresponding hydrate is insoluble alkali, its oxide does not react with water, such as: copper oxide does not react with water, alkali metal sodium, potassium, etc., as well as calcium and barium oxides can react with water to form corresponding hydroxides. They are both strong bases.

Notes:

Oxides that can react with acids are not necessarily basic oxides, such as SiO2 can react with HF, SiO2 is an acidic oxide, but not a basic oxide (it should be noted that SiO2 can react with HF is a characteristic of SiO2, and has nothing to do with whether it is a basic oxide or an acidic oxide).

Alkali metal oxides are not necessarily basic oxides, such as Na2O2 can react with water to form alkalis, but it is a peroxide rather than a basic oxide. Because it has oxygen in addition to producing bases, it is not a basic oxide.

The above content refers to Encyclopedia - Acidic Compounds.

Encyclopedia - Basic oxides.