Classifying oxides
What are oxides?
- Oxides are compounds made from one or more atoms of oxygen combined with one other element
- Examples of oxides include: MgO, ZnO, K2O, CO2, SO2, H2O
- Oxides can be classified based on their acid-base characteristics
Acidic oxides
- Acidic oxides are formed when a non-metal element combines with oxygen
- They react with bases to form a salt and water
- When dissolved in water they produce an acidic solution with a low pH
- Common examples include CO2, SO2, NO2 and SiO2
Basic oxides
- Basic oxides are formed when a metal element combines with oxygen
- They react with acids to form a salt and water
- When dissolved in water they produce a basic solution with a high pH
- Common examples include CuO and CaO
Basic and acidic oxides
Metals form basic oxides while non-metals form acidic oxides