Question

Copy and complete the following table. Column 3 has the names of gases to be prepared using the substance you enter in Column 1, alongwith dilute or concentrated sulphuric acid, as indicated in Column 2.

Column 1	Column 2	Column 3
Substance reacted with acid	Dilute or concentrated sulphuric acid	Gas
		hydrogen
		carbon dioxide
		only chlorine

Write the equation for the laboratory preparation of:
(i) Sodium sulphate using dilute sulphuric acid.
(ii) Lead sulphate using dilute sulphuric acid.

Answer 1

Column 1	Column 2	Column 3
Substance reacting with acid	Dilute or concentrated sulphuric acid	Gas
Metals (zinc)	Dilute sulphuric acid	Hydrogen
Metallic carbonates (calcium carbonate)	Dilute sulphuric acid	Carbon dioxide
Bleaching powder	Dilute sulphuric acid	Only chlorine

Given below are the balanced chemical equations for the laboratory preparation of:

(i) Sodium sulphate using dilute sulphuric acid:

Na₂SO₃ + H₂SO₄ → Na₂SO₄ + H₂O + SO₂

(ii) Lead sulphate using dilute sulphuric acid:

Pb(NO₃)₂ + H₂SO₄ → PbSO₄↓ + 2HNO₃