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GCSE Board Chemistry --Sulfuric Acid - The Contact Process-Name two Raw Materials used to make Sulfuric Acid?

Sulfuric acid has many uses in industry.
The amount of sulfuric acid which a country uses in one year
can be a measure of that country's economic development
(how modern or wealthy it is).

Raw Materials.

The raw materials (the things you need) are sulfur, air and water.
Sulfur is available from fossil fuels and sulfide ores.

When sulfur in fossil fuels is burned it produces sulfur dioxide gas.

sulfur + oxygen sulfur dioxide.
S(s) + O2(g) SO2(g)


Sulfide ores are heated in air
to produce the metal oxide and sulfur dioxide gas, for example

lead sulfide + oxygen lead oxide + sulfur dioxide.
2PbS(s) + 3O2(g) 2PbO(s) + 2SO2(g)

The metal is then extracted from the metal oxide.

Sulfur is oxidised in these reactions to become sulfur dioxide.
Both reactions are exothermic.
The sulfur dioxide gas produced from both of the above methods
is used to make sulfur trioxide.
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