2
Question Question 3(ii)
Distinguish between the following as directed.
(a) Sodium carbonate and sodium sulphate using H2SO4.
(b) Lead (II) oxide and zinc oxide using H2SO4.
(a) Sodium carbonate reacts with sulphuric acid and gives white coloured sodium sulphate along with water and carbon dioxide.
Na2CO3 + H2SO4 ⟶ Na2SO4 + H2O + CO2
On the other hand sodium sulphate reacts with sulphuric acid and gives colourless sodium hydrogen sulphate. Hence, the two can be distinguished.
Na2SO4 + H2SO4 ⟶ 2NaHSO4
(b) Lead oxide reacts with sulphuric acid and gives white coloured lead sulphate along with water.
PbO + H2SO4 ⟶ PbSO4 + H2O
On the other hand zinc oxide reacts with sulphuric acid and gives colourless zinc sulphate along with water.
ZnO + H2SO4 ⟶ ZnSO4 + H2O