9.03.9 Past Paper Qs & A

Use Sulphuric acid

Heat acid

add MgO or Mg(OH)₂ or MgCO₃ powder

to acid and stir until no more dissolves

Filter off excess powder

Allow filtrate to evaporate

H₂SO₄ + MgO --> MgSO₄ + H₂Oor

or H₂SO₄ + Mg(OH)₂ --> MgSO₄ + 2H₂O

or H₂SO₄ + MgCO₃ --> MgSO₄ + H₂O + CO₂