Question

What happens when dilute sulphuric acid is treated with: 

a. Fe? 

b. CaF₂?

Answer 1

a. Dilute H₂SO₄ reacts with Fe which is below hydrogen in the electrochemical series, with the evolution of H₂.

Fe (Iron) + H₂SO₄ (Sulphuric acid) → FeSO₄ (Ferrous sulphate) + H₂ (Hydrogen)

b. When H₂SO₄ is added to calcium fluoride, hydrogen fluoride is obtained. 

CaF₂ (Calcium fluoride) + H₂SO₄ (Sulphuric acid) → CaSO₄ (Calcium sulphate) + 2HF (Hydrogen flurode)