Silicic acid

Metasilicic acid
Silicic acid /sɪˈlɪsɪk ˌæsɪd/ is the general name for a family of chemical compounds containing the element silicon attached to oxide and hydroxyl groups. This family of compounds has the general formula n. No simple silicic acids has been identified, these species being primarily of theoretical interest.

Silicic acid was invoked by Jöns Jacob Berzelius in the early 19th century. Silicic acid is thought to be produced by a non-biological process called hydration:

Since no inorganic silicic acid has been purified, the reactivity of these species is inferred rather than observed. Generally silicic acids degrade to silicon dioxide and water. Like other silanols, silicic acids are a weak acid. The conjugate bases also are poorly defined. Examples have not been purified.

Examples, often only of theoretical interest, include: metasilicic acid (H2SiO3), i.e. the chain or cyclic n orthosilicic acid (H4SiO4, i.e. Si(OH)4 with calculated pKa1=9.84, pKa2=13.2 at 25 °C) disilicic acid (H2Si2O5), i.e. the polymer n pyrosilicic acid (H6Si2O7), i.e. O(Si(OH)3)2

orthosilicic acid

This page was last edited on 25 January 2018, at 13:36.
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