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===Precipitated silica=== Precipitated silica or amorphous silica is produced by the acidification of solutions of [[sodium silicate]]. The gelatinous precipitate or [[silica gel]], is first washed and then dehydrated to produce colorless microporous silica.<ref name="Greenwood"/> The idealized equation involving a trisilicate and [[sulfuric acid]] is: :<chem>Na2Si3O7 + H2SO4 -> 3 SiO2 + Na2SO4 + H2O</chem> Approximately one billion kilograms/year (1999) of silica were produced in this manner, mainly for use for polymer composites β tires and shoe soles.<ref name=Ull/>
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