Lesson 4 of 4 · Form 3 Chemistry
Sulphur and sulphuric acid
18 min
Sulphur
Extracted by the Frasch process (superheated water and hot air pumped underground). Allotropes: rhombic and monoclinic sulphur.
Contact process
1. Burn sulphur: S + O₂ → SO₂
2. 2SO₂ + O₂ ⇌ 2SO₃ (catalyst vanadium(V) oxide, about 450°C, 1-2 atm)
3. SO₃ is absorbed in concentrated sulphuric acid to form oleum: SO₃ + H₂SO₄ → H₂S₂O₇
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