Orthosilicate
Anion SiO4−4, or any of its salts and esters / From Wikipedia, the free encyclopedia
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In chemistry, orthosilicate is the anion SiO4−
4, or any of its salts and esters. It is one of the silicate anions. It is occasionally called the silicon tetroxide anion or group.[1]
Orthosilicate salts, like sodium orthosilicate, are stable, and occur widely in nature as silicate minerals, being the defining feature of the nesosilicates.[2] Olivine, a magnesium or iron(II) orthosilicate, is the most abundant mineral in the upper mantle.
The orthosilicate anion is a strong base, the conjugate base of the extremely weak orthosilicic acid H
4SiO
4 (pKa2 = 13.2 at 25 °C). This equilibrium is difficult to study since the acid tends to decompose into a hydrated silica condensate.[3]