Alkaline oxide + acid = salt + water.

Reaction of iron oxide and dilute hydrochloric acid: Fe?O?＋6HCl =2FeCl?＋3H?O

Reaction of iron oxide and dilute sulfuric acid: Fe?O?＋3H?SO?=Fe? (SO?)?+3H?O

Reaction of copper oxide and dilute hydrochloric acid: CuO + 2HCl =CuCl2 + H?O

Reaction of copper oxide and dilute sulfuric acid: CuO + H?SO ?＝CuSO?＋H?O

Reaction of magnesium oxide and dilute sulfuric acid: MgO + H?SO?＝MgSO?＋H?O

Reaction of calcium oxide and dilute hydrochloric acid: CaO + 2HCl = CaCl?＋H?O

Note

Oxides that can react with acids are not necessarily alkaline oxides. For example, SiO? can react with HF, and SiO? is an acidic oxide. , but not an alkaline oxide (it should be noted that SiO? can react with HF is a characteristic of SiO?, regardless of whether it is an alkaline oxide or an acidic oxide).

Alkali metal oxides are not necessarily alkaline oxides. For example, Na?O? can react with water to form alkali, but it is a peroxide rather than an alkaline oxide. Because it contains oxygen in addition to producing a base, it is not an alkaline oxide.