Water solubility of oxides and reaction with water acid 5

Basic oxides are soluble in water and react with water to form alkaline (common) Na2O + H2O = 2NaOH

cao +h2o = ca(oh)2

k2o +h2o = 2koh

Magnesium oxide dissolves in hot water. Other basic oxides are insoluble in water and cannot react with water. For example, copper oxide is insoluble in water and does not react with water.

Both basic oxides react with acids to form salts and water.

fe2o3+6hcl→2fecl3+3h2ona2o +h2so4 = na2so4+ h2o

There are several types:1Non-metallic oxides.

a.Soluble in water to form acids, such as sulfur trioxide, sulfur dioxide, carbon dioxide, homochloride, nitrogen dioxide, phosphorus pentoxide, etc.

b.Insoluble in water, such as silica, silicic acid is obtained by other methods.

c.Acids are not formed, such as carbon monoxide.

2.Metal oxides, also divided into several cases.

a.and water to form alkali, there are alkali metals, alkaline earth metals.

b.Insoluble in water, but it is an alkaline oxide, which can be formed by other methods, such as magnesium oxide, beryllium oxide, copper oxide, etc.

c.There are multiple transition metals with valence, generally the low price is basic oxide, ** is acid oxide.

A typical example is manganese, +2 and +3 of manganese are all basic oxides, +6 and +7 are acidic oxides, and permangantic acid is still a strong acid.

Not necessarily, the acidic oxide SiO2 does not react with water.

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.

The hydrate corresponding to the acid oxide is oxygenated acid, such as the hydrate corresponding to SO3 is H2SO4, the hydrate corresponding to CO2 is H2CO3, and the hydrate corresponding to SiO2 is H2SiO3, etc. Most of the acidic oxides can be directly combined with water to form oxygenated acids, and a few acidic oxides (SiO2) cannot react directly with water. Acid oxides are generally prepared by direct oxidation of non-metals or thermal decomposition of oxygenated acids and oxytates.

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

2.Reacting with a base produces only one type of salt and water.

3.Reacts with basic oxides.

Basic oxides + acid salts + water. Iron oxide and dilute hydrochloric acid reaction: Fe O 6HCl = 2FeCl 3H O Iron oxide and dilute sulfuric acid reaction:

fe₂o₃＋3h₂so₄＝fe₂（so₄）₃3h₂o

Copper oxide and dilute hydrochloric acid reaction: Cuo + 2HCl = CuCl2 + H o Copper oxide and dilute sulfuric acid reaction: Cuo + H so Cuso H o Magnesium oxide and dilute sulfuric acid reaction:

MGO + H So Mgso HO Calcium Oxide and Dilute Hydrochloric Acid Reaction: Cao + 2HCl = CaCl H O<>

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

Oxides of alkali metals are not necessarily basic oxides, such as Na O can react with water to form alkalis, but it is a peroxide and not a basic oxide. Because it has oxygen in addition to producing bases, it is not a basic oxide.

1.At present, there is only silicon dioxide.

2.Silica: An acidic oxide that corresponds to silicic acid as hydrate.

3.Silica is insoluble in water and insoluble in acid, but soluble in hydrofluoric acid and hot concentrated phosphoric acid, and can be used as a slow sign with molten alkalis.

4.There are two types of natural disturbance concessions: crystalline silica and amorphous silica.

5.Silica is widely used in the manufacture of glass, water glass, pottery, enamel and refractory materials, among others.

6.Acid oxides: generally oxides of non-metallic elements and **oxides of certain transition metal elements.

7.Most acidic oxides are soluble in water and react with water to form their respective acids.

At present, only silica is available.

Silica: An acidic oxide that corresponds to silicic acid as hydrate. Silica is insoluble in water and insoluble in acid, but soluble in hydrofluoric acid and hot concentrated phosphoric acid, and can work with molten alkalis.

In nature, there are two kinds of crystalline dioxane modified silicon and amorphous silica. Silica is widely used in the manufacture of glass, water glass, pottery, enamel and fire-resistant materials.

Acid oxides: generally oxides of non-metallic elements and ** oxides of some transitional elements. Most acidic oxides are soluble in water and react with water to form their corresponding acids.