Pyrosilicic acid: Difference between revisions

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

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Latest revision as of 06:18, 24 September 2022

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]

{\ce {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

^ 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.
^ 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
^ 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

[synthesis-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.

[goto-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

[bech-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

[1]

[2]

[3]

@@ Line 1: / Line 1: @@
+{{Short description|Silicic acid with the formula (HO)3–Si–O–Si–(OH)3}}
 {{Chembox
 | Verifiedfields = changed
 | Watchedfields = changed
 | verifiedrevid =
-| IUPACName = Trihydroxysilyl trihydrogen orthosilicate<ref name=chemspider/>
+| IUPACName = Trihydroxysilyl trihydrogen orthosilicate
-| OtherNames =
+| OtherNames = disilicic acid
-| ImageFile =
+| ImageFile = Pyrosilicic-acid-3D-balls.png
-| ImageSize =
+| ImageSize = 200px
-| ImageName =
+| ImageName = Pyrosilicic acid
 |Section1={{Chembox Identifiers
-| InChI1 =
+| CASNo = 20638-18-0
-| InChIKey1 =
-| CASNo =
 | CASNo_Ref = {{cascite|changed|CAS}}
+| PubChem = 61804
-| UNII_Ref = {{fdacite|changed|FDA}}
-| UNII =
+| ChemSpiderID = 55684
-| PubChem =
-| ChemSpiderID =
 | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
-| EINECS =
+| ChEBI = 29292
 | ChEBI_Ref = {{ebicite|correct|EBI}}
-| ChEBI =
+| Gmelin = 26937
 | StdInChI_Ref = {{stdinchicite|correct|chemspider}}
 | StdInChI = 1S/H6O7Si2/c1-8(2,3)7-9(4,5)6/h1-6H
@@ Line 26: / Line 23: @@
 | StdInChIKey = KDJOAYSYCXTQGG-UHFFFAOYSA-N
 | SMILES = O[Si](O)(O)O[Si](O)(O)O
-| InChI =
-| InChIKey =
-| Gmelin =
 }}
 |Section2={{Chembox Properties
 | H=6 | O=7 | Si=2
 | pKa =
+| ConjugateBase = [[Pyrosilicate]]
 | MagSus =
 }}
@@ Line 38: / Line 33: @@
 }}
-'''Pyrosilicic acid''' is the [[chemical compound]] with formula {{chem|H|6|Si|2|O|7}}, or {{chem|(|HO|)|3|Si}}-O-{{chem|Si|(|OH|)|3}}.  It is one of the [[silicic acid]]s. It has never been isolated in pure form, but it is assumed to be present in solutions of [[silicon dioxide]] (silica) {{chem|SiO|2}} in water, in equilibrium with other silicic acids and [[silicate]] ions.<ref name=chemspider>[http://www.chemspider.com/Chemical-Structure.55684.html "Pyrosilicic acid"]. ''Chemspider'' webpage, CSID:55684, accessed on 2018-05-26</ref>
+'''Pyrosilicic acid''' is the [[chemical compound]] with formula {{chem2|H6Si2O7}} or {{chem2|(HO)3SiOSi(OH)3}}. It is one of the [[silicic acid]]s and has [[pyrosilicate]] as its [[conjugate base]].
+It was synthesized, using nonaqueous solutions, in 2017.<ref name=synthesis>{{cite journal |last1=Igarashi |first1=Masayasu |last2=Matsumoto |first2=Tomohiro |last3=Yagahashi |first3=Fujio |last4=Yamashita |first4=Hiroshi |last5=Ohhara |first5=Takashi |last6=Hanashima |first6=Takayasu |last7=Nakao |first7=Akiko |last8=Moyosh |first8=Taketo |last9=Sato |first9=Kazuhiko |last10=Shimada |first10=Shigeru |title=Non-aqueous selective synthesis of orthosilicic acid and its oligomers |journal=Nature Communications |date=2017 |volume=8 |issue=1 |pages=140 |doi=10.1038/s41467-017-00168-5|pmid=28747652|pmc=5529440|bibcode=2017NatCo...8..140I }}</ref>
-The salts of pyrosilicic acid are called [[pyrosilicate]]s, such as [[sodium pyrosilicate]], and are stable.  They occur in nature as a class of [[silicate minerals]], specificlaly the [[sorosilicate]]s.
+:<chem>H6Si2O7(aq) -> 2 SiO2(s) + 3 H2O</chem>
+Pyrosilicic acid may be present in [[sea water]] and other natural waters at very low concentration.<ref name=goto>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}}</ref><ref name=bech>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}}</ref> Compounds formally derived from it, such as [[sodium pyrosilicate]], are found in the [[sorosilicate]] minerals.
-==Reactions==
-Like other silicic acids, pyrosilicic acid is unstable in solution, and tends to polymerize or hydrolyze.<ref name=goto>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}}</ref><ref name=bech>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}}</ref><ref name=ramberg>Hans Ramberg (1952): "Chemical Bonds and Distribution of Cations in Silicates".  ''The Journal of Geology'' volume 60, issue 4, pages 331-355. {{doi|10.1086/625982}}</ref>
 ==References==
 {{reflist}}
+[[Category:Oxoacids]]
 [[Category:Silicon compounds]]