Question

5(c)(i). Town water that has passed through iron pipes contains P and Q ions. In the presence of air, P ions are slowly converted to Q ions. I. Identify P and Q ions. II. Write a balanced equation for the reaction between P ions, hydrogen ions and oxygen to give Q ions and water.

Model answer

I. P ions are Fe²⁺ (iron(II)) ions, while Q ions are Fe³⁺ (iron(III)) ions. II. 4Fe²⁺(aq) + O₂(g) + 4H⁺(aq) → 4Fe³⁺(aq) + 2H₂O(l).

Accepted Answer

I. P ions are Fe²⁺ (iron(II)) ions, while Q ions are Fe³⁺ (iron(III)) ions.
II. 4Fe²⁺(aq) + O₂(g) + 4H⁺(aq) → 4Fe³⁺(aq) + 2H₂O(l).

WAEC Chemistry 2015 Theory — Question 46

Sign up free to unlock