Pyrosilicic acid

Pyrosilicic acid

Pyrosilicic acid
Names
IUPAC name Trihydroxysilyl trihydrogen orthosilicate
Other names disilicic acid
Identifiers
CAS Number	20638-18-0  N
3D model (JSmol)	Interactive image
ChEBI	CHEBI:29292  Y
ChemSpider	55684  Y
Gmelin Reference	26937
PubChem CID	61804
CompTox Dashboard (EPA)	DTXSID201014501
InChI InChI=1S/H6O7Si2/c1-8(2,3)7-9(4,5)6/h1-6H Y Key: KDJOAYSYCXTQGG-UHFFFAOYSA-N Y
SMILES O[Si](O)(O)O[Si](O)(O)O
Properties
Chemical formula	H6O7Si2
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). N (what is  YN ?) Infobox references

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]

H₆Si₂O₇(aq) → 2 SiO₂(s) + 3 H₂O

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.

References

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