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Acids and Alkalis

Manufacture of Sulfuric Acid  -  The Contact Process.

Effect of Pressure.

sulfur dioxide + oxygen  reversible arrow  sulfur trioxide
 2SO2(g)        +    O2(g)   reversible arrow          2SO3(g)

Increasing the pressure will increase the rate of the reaction
 and increase the yield of sulfur trioxide
 (compare this with the formation of ammonia from the Haber process).

The reaction is run at between 1 and 2 atmospheres
which gives 99% conversion of sulfur dioxide to sulfur trioxide.

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