How to distinguish between acidic and alkaline oxides, and how to tell if it is acidic or basic

Oxides that can react with alkalis to form salts and water are called acidic oxides because they have acid-like substances.

Most of the non-metallic oxides are acidic oxides (such as CO2, SO3, P2O5, etc.), except for CO, NO, AS2O3, TeO2, etc.

The ** oxides of some transition elements are also acidic oxides (such as CRO3, Mn2O7, etc.).

The hydrate corresponding to the acidic oxide is an oxygenated acid.

Most acidic oxides react with water to form oxygenated acids.

Acidic oxides react with basic oxides to form oxygenates.

Basic oxides.

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 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.

Alkali metals and oxides of calcium, strontium and barium can react with water to form corresponding hydroxides. Other basic oxides cannot react with water. 

Because some oxides can react with acid solutions, this oxide is called an alkaline oxide.

See if it will be dissolved in water, such as carbon dioxide dissolved in water into carbonic acid, which is acidic, and generally non-metallic oxides are acidic oxides, except for carbon monoxide and nitric oxide; In general, metal oxides react with water to form corresponding alkalis, so we generally treat metal oxides as basic oxides, except for manganese metal.

Acidic oxides can react with alkalis to form salts and water, and alkaline oxides can react with acids to form salts and water (with some exceptions).

If you look at the periodic table, it is generally said that non-metal oxides are acidic oxides, and metal oxides are basic oxides.

Just know a few special cases, such as manganese dioxide is neither an acidic oxide nor a basic oxide, and it is called a salt oxide.

There are also alumina and zinc oxides that are amphoteric oxides.

Metal oxides are generally basic, and inorganic oxides are generally acidic.

Acidic oxides: react with bases to produce only salts and water.

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

1. Judgment of acid oxides: write the corresponding acids according to the non-metallic elements other than oxygen, and then remove the water from the hydrogen atoms and oxygen atoms at 2:1, and the remaining ones are acid oxides.

2. Judgment of basic oxides: write the corresponding bases according to the metal elements, and then remove the water from the hydrogen atoms and oxygen atoms at 2:1, and the rest is the basic oxide.

Note 1: Most of the acidic oxides are non-metallic oxides.

2. Most of the non-metallic oxides are acidic oxides.

3. Only oxygenated acids have acidic oxides.

4. Carbon monoxide, nitric oxide, and nitrogen dioxide are not acidic oxides.

Hello! It is not difficult to understand the relevant concepts and remember some special cases.

1. Any oxide that can react with alkali to form salt and water is called an acidic oxide.

Most acid oxides are non-metal oxides (e.g., CO2, SO2, SO3, P2O5, SiO2), but some are metal oxides (e.g., MN2O7).

Note: Non-metallic oxides are not necessarily acidic oxides (e.g., CO, NO, etc. are non-salt oxides).

2. Any oxide that can react with acid to form salt and water is called basic oxide.

Basic oxides are all metal oxides (e.g., Na2O, CaO, BAO, Cuo, etc.).

Acidic oxides can react with alkalis to form oxides of salt and water. Acid oxides are mostly non-metallic oxides, and a few are metal oxides. The hydrate corresponding to acidic oxides is oxygenated acids, and acidic oxides are also known as anhydrides of oxygenated acids.

Basic oxides are oxides that react with acids to form salts and water. Basic oxides are all metal oxides.

It is an alkaline oxide that can react with acid to form salt and water and does not react with alkali, an acidic oxide that can react with alkali to form salt and water and does not react with acid, an amphoteric oxide that can react with both acid and alkali to form salt and water, and an oxide that does not react with acid and alkali.

Oxides that react with acids to produce only salt and water are basic oxides, and oxides that react with alkali to produce only salt and water are acidic oxides.

Basic oxides are all metal oxides.

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

Basic oxides include: 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。Wide bends.

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 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.