Acidic oxides

Question 1

What are acidic oxides

Answer 1

Oxides of non-metals that neutralize bases to form salt and water only
React with bases to form salt and water
Eg. Carbon dioxide
1) CO2 + 2NaOH —> Na2CO3 + H2O
2) SO3 + 2NaOH—-> 2NaSO4 + H2O

Question 2

What are acid anhydrides

Answer 2

An acidic oxide which dissolves in water to solve an acid solution
CO2 + H2O —> H2CO3
SO3 + H2O —> H2SO4
NO2 is a mixed acid anhydride because it dissolves in water to form 2 acids
SO2 + H2O —-> H2SO3

Question 3

Basic oxides

Answer 3

Oxides of metal which neutralize acids to form salt and water only. For ex. the basic oxide MgO neutralizes sulphuric acid to form magnesium sulphate (salt) and water
MgO + H2SO4 —> MgSO4 +H2O

Question 4

basic oxides can either be

Answer 4

Soluble or insoluble oxides. Soluble oxides dissolve in water to form alkaline solutions
Sodium reacts with Water to form NaOH
Na2O + H2O —> 2NaOH
Potassium oxide reacts with water to form KOH
K2O + H2o –> 2KOH

Question 5

Neutral oxides

Answer 5

Oxides of non metals that neither neutralizes acids or bases eg. CO, NO and H2O

Question 6

Amphoteric Oxides

Answer 6

Oxides of metals that neutralize both acid and bases to form salt and water
Eg. Al2O3, ZnO
Al2O3 + 6HCL —-> 2AlCl3 + 3H2O
Al2O3 + 2NaOH —-> 2NaAlO2 + H2O (sodium aluminate)