Purpose
The purpose of this research is to know the properties of oxygen and to prepare different oxides, acids and bases.
Experiments
Carbon is reacted with oxygen in order to form carbon dioxide. Sulphur is reacted with oxygen in order to form sulphur dioxide and calcium is reacted with oxygen in order to form calcium oxide. As calcium is metal, the formed metal i.e. the calcium oxide is a metallic oxide. On the other hand, as carbon and sulphur are non – metallic, therefore, the formed oxides i.e. carbon dioxide and sulphur dioxide are also non – metallic oxides.
If non – metallic oxides are reacted with water, it produces acids and if metallic oxides are reacted with water, acid is formed. Carbon dioxide is added with water in order to form carbonic acid. Sulphur dioxide is reacted with water and it forms sulphuric acid. As carbon dioxide and sulphur dioxide both are non –metallic oxides, acids are formed.
Calcium oxide is added with water to form calcium hydroxide. As calcium oxide is a metallic oxide, a base is formed.
Decomposition takes place when oxygen containing compounds are heated. In case of noble metal compounds, if the compounds are heated, the metal and oxygen get separated.
On the other hand there are certain metallic oxides which when heated liberate only a part of the oxygen.
Conclusion
Acidic anhydride can be defined as the non-metallic oxide that can produce acid reacting with water and basic anhydride can be defined as the metallic oxide that can produce base reacting with water.
Preparation of oxide with a metal:
4Na + O2 = 2Na2O2
Preparation of base:
MgO + H2O = Mg(OH)2
