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Chemistry
Erica Bryant
2 May, 17:21
What is contact process
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Samuel Riley
2 May, 20:43
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See below
Step-by-step explanation:
The contact process is an Industrial method of producing sulfuric acid.
Step 1. Conversion of S to SO₂
Molten sulfur is burned in an excess of air.
S (ℓ) + O₂ (g) ⟶ SO₂ (g)
Step 2. Conversion of SO₂ to SO₃
The hot mixture of SO₂ and excess air at about 425 °C and 1.5 atm is passed over a hot V₂O₅ catalyst.
SO₂ (s) + O₂ (g) ⇌ SO₃ (g)
The SO₂ is converted to SO₃ in an equilibrium reaction.
Step 3. Conversion of SO₃ to H₂SO₄
(a) The SO₃ is dissolved in concentrated H₂SO₄.
SO₃ (g) + H₂SO₄ (ℓ) ⟶ H₂S₂O₇ (ℓ)
The product is fuming sulfuric acid.
(b) Then, enough water is added to react with the dissolved SO₃ and form concentrated H₂SO₄.
H₂O (ℓ) + H₂S₂O₇ (ℓ) ⟶2H₂SO₄ (ℓ)
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