Pyrosilicic acid

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.

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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

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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.