Definition and properties of oxides and basic oxides
Acidic oxide is a kind of oxide which can form acid or react with water to form salt and water. Generally non-metallic elements of oxides and certain transition metal elements of high-priced oxide. Such as sulfur trioxide SO3, phosphorus pentoxide P2O5, manganese dioxide Mn2O7, chromium trioxide CrO3 and so on.
Acid oxide corresponding to the hydrate is acid, such as CO2 corresponding to the hydrate is H2CO3, N2O5 corresponding hydrate is HNO3.
Note: Most of the non-metallic oxides are acidic oxides. In our familiar non-metallic oxides, carbon monoxide and nitric oxide are not acidic oxides and are usually classified as non-acid oxides.
React with the acid to produce salt and water, this oxide called alkaline oxide (and the product can only have salt and water, can not have any other substances generated). Alkaline oxides include low-valent oxides of active metal oxides and other metals such as Na2O, CaO, BaO and CrO, MnO.
The corresponding hydrate of the basic oxide is a base. For example, CaO corresponding to the hydrate is Ca (OH) 2, Fe2O3 corresponding to the hydrate is Fe (OH) 3.