Pyrosilicic acid

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Pyrosilicic acid
Pyrosilicic acid
IUPAC name
Trihydroxysilyl trihydrogen orthosilicate
Other names
disilicic acid
3D model (JSmol)
  • InChI=1S/H6O7Si2/c1-8(2,3)7-9(4,5)6/h1-6H checkY
  • O[Si](O)(O)O[Si](O)(O)O
Molar mass 174.211 g·mol−1
Conjugate base Pyrosilicate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Pyrosilicic acid is the chemical compound with formula H6Si2O7 or (HO)3SiOSi(OH)3. It is one of the silicic acids and has pyrosilicate as its conjugate base.

It was synthesized, using nonaqueous solutions, in 2017.[1]

Pyrosilicic acid may be present in sea water and other natural waters at very low concentration.[2][3] Compounds formally derived from it, such as sodium pyrosilicate, are found in the sorosilicate minerals.


  1. ^ Igarashi, Masayasu; Matsumoto, Tomohiro; Yagahashi, Fujio; Yamashita, Hiroshi; Ohhara, Takashi; Hanashima, Takayasu; Nakao, Akiko; Moyosh, Taketo; Sato, Kazuhiko; Shimada, Shigeru (2017). "Non-aqueous selective synthesis of orthosilicic acid and its oligomers". Nature Communications. 8 (1): 140. Bibcode:2017NatCo...8..140I. doi:10.1038/s41467-017-00168-5. PMC 5529440. PMID 28747652.
  2. ^ Katsumi Goto (1956): "Effect of pH on Polymerization of Silicic Acid". Journal of Physical Chemistry, volume 60, issue 7, pages 1007–1008. doi:10.1021/j150541a046
  3. ^ M. F. Bechtold (1955): "Polymerization and Properties of Dilute Aqueous Silicic Acid from Cation Exchange". Journal of Physical Chemistry, volume 59, issue 6, pages 532–541. doi:10.1021/j150528a013