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Chemistry

Give balanced equations for the manufacture of sulphuric acid by the Contact process.

Sulphuric Acid

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Answer

Contact process:

Sulphur or Pyrite Burner:
S + O2 ⟶ SO2
4FeS2 + 11O2 ⟶ 2Fe2O3 + 8SO2

Contact Tower :

2SO2+O2450500°C /12 atmosV2O52SO3+45 K cals2\text{SO}2 + \text{O}2 \xrightleftharpoons[450-500\text{\degree C }/1 - 2 \text{ atmos}]{\text{V}2\text{O}5} 2\text{SO}_3 + 45 \text{ K cals}

Absorption Tower :
SO3 + H2SO4 ⟶ H2S2O7

Dilution Tank:
H2S2O7 + H2O ⟶ 2H2SO4

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