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  Inorganic Chemistry

SILICA OR SILICON DIOXIDE ( SiO2)

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It occurs in nature in various forms such as sand, quartz and flint .It is also a constituent of various rocks. It is solid at room temperature. It is insoluble in water.
Silica has a three dimensional network structure in which each Si is bonded to four oxygen atoms which are tetrahedrally disposed around silicon atom. Each O atom is shared by two Si atoms. It may be noted that CO2 is a gas, while SiO2 is hard solid with very high melting point.

Si O2 + 4HF——> Si F4 + 2H2O

Si F4 + 2HF ——> H2SiF6

(Hydro fluoro silicic acid)

HF readily dissolves Silica, therefore HF cannot be store in glass bottles which contain Silica.

It is used in large amount to form mortar which is a building material. It is also used in the manufacture of glass and lenses.

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