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Some Reactions Of Alkaline Oxides

wallpapers Resource 2020-12-01
Oxides are compounds (of course they must be pure). Its composition contains only two elements, one of which must be oxygen element, if the other is a metal element, it is called a metal oxide; if the other is not a metal element, it is called a non-metal oxide.
 
Alkaline oxide
 
We know that alkali reacts with acid to form salt and water, and acid reacts with certain metal oxides to form salt and water.
E.g:
2HCl+CuO=CuCl2+H2O
3H2SO4+Fe2O3=Fe2(SO4)3+3H2O
The above reaction shows that copper oxide and iron oxide have similar properties to alkali. Therefore, people call the oxides of copper oxide and iron oxide that can react with acids and only salt and water are called alkaline oxides. (SiO2 can react with HF, but SiO2 is an acidic oxide (SiO2 can react with HF is the characteristic of SiO2, and it has nothing to do with whether it is an alkaline oxide or an acidic oxide)) (Alkaline oxides include active metal oxides and other Metal low-valent oxides, such as Na2O, CaO, BaO, CrO, MnO, etc.)
Most metal oxides are alkaline oxides, but there are many other types, with exceptions such as Mn2O7 (acidic oxide), Al2O3 (amphoteric oxide), ZnO (amphoteric oxide), MnO2 (amphoteric oxide) and so on.
Although the acidic oxide is not necessarily a non-metal oxide (such as Mn2O7), we can say that the basic oxide must be a metal oxide.

 
With water
The corresponding hydrate of the alkaline oxide is an alkali, and the corresponding alkali is a soluble alkali that can directly combine with water to form an alkali.
However, there are not many soluble bases, so there are not many alkaline oxides that can directly combine with water to form bases. Common ones are K2O, Na2O, BaO, CaO, etc.
In theory only, basic oxides can be regarded as the products of corresponding alkali dehydration.
Insoluble alkalis can be decomposed by heat to generate corresponding alkaline oxides and water.
 
With acid
Alkaline oxides can react with acids to form salt and water.
 
With acidic oxide
Under certain conditions, alkaline oxides and acidic oxides react to form salts.
 
With salt
Basic oxides generally do not react with normal salts and basic salts, but can react with acid salts.

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