Pyrosilicic acid

Pyrosilicic acid
Names
	IUPAC name Trihydroxysilyl trihydrogen orthosilicate
	Other names disilicic acid
Identifiers
CAS Number	20638-18-0 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:29292 ;
ChemSpider	55684 ;
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 Key: KDJOAYSYCXTQGG-UHFFFAOYSA-N ;
	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). (what is ?) 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.

H₆Si₂O₇(aq) → 2 SiO₂(s) + 3 H₂O

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