Sodium pyrosilicate

Last updated
Sodium pyrosilicate
Names
Other names
hexasodium diorthosilicate
Identifiers
3D model (JSmol)
EC Number
  • 239-671-1
PubChem CID
UNII
  • InChI=1S/6Na.O7Si2/c;;;;;;1-8(2,3)7-9(4,5)6/q6*+1;-6
    Key: PMYUVOOOQDGQNW-UHFFFAOYSA-N
  • [Si](O[Si]([O-])([O-])[O-])([O-])([O-])[O-].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+]
Properties
Na6O7Si2
Molar mass 306.102 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Sodium pyrosilicate is the chemical compound Na
6
Si
2
O
7
. It is one of the sodium silicates, specifically a pyrosilicate, formally a salt of the unstable pyrosilicic acid H
6
Si
2
O
7
. [1] [2]

Contents

Structure

The anhydrous solid has the triclinic crystal structure, with space group P1 (a = 5.8007(8) Å, b = 11.5811(15) Å, c = 23.157(3) Å, α = 89.709(10)°, β = 88.915(11)°, γ = 89.004(11)°, V = 1555.1(4) Å3, Z = 8, Dx = 2.615 g·cm−3, μ(Mo‐Kα) = 7.94 cm−1). The Si
2
O6−
7
anions are arranged in layers parallel to the (100) plane, with the sodium cations distributed in 24 distinct crystallographic positions, coordinated by 4 to 6 near oxygen atoms. Some of the 4-coordinated sodium atoms can be interpreted as parallel columns of edge-sharing NaO
4
tetrahedra. The columnar arrangement forms tunnels that house the remaining sodium cations. Twinning at a microscopic scale simulates a much larger monoclinic C centered lattice (V′ = 6220 Å3, Z = 32). [3]

See also

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4−x
]
n
, where 0 ≤ x < 2. The family includes orthosilicate SiO4−4, metasilicate SiO2−3, and pyrosilicate Si2O6−7. The name is also used for any salt of such anions, such as sodium metasilicate; or any ester containing the corresponding chemical group, such as tetramethyl orthosilicate. The name "silicate" is sometimes extended to any anions containing silicon, even if they do not fit the general formula or contain other atoms besides oxygen; such as hexafluorosilicate [SiF6]2−.Most commonly, silicates are encountered as silicate minerals.

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Si
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SiO
3
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2
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2
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, for various values of x, y, and z; or, equivalently, Mg
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(OH)
2x
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2y
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2
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O
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x
CoO
2
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x
CoO
2
·yH
2
O
.

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4
SiO
4
. It is one of the sodium silicates, specifically an orthosilicate, formally a salt of the unstable orthosilicic acid H
4
SiO
4
.

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2
O6−
7
, or an organic compound with the hexavalent ≡O
3
Si
-O-SiO
3
≡ group. The anion is also called disilicate or diorthosilicate.

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2
O
4
, consisting of sodium cations Na+
and hydrogenoxalate anions HC
2
O
4
or HO(O=)C-C(=O)O
. The anion can be described as the result of removing one hydrogen ion H+
from oxalic acid H
2
C
2
O
4
, or adding one to the oxalate anion C
2
O2−
4
.

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References

  1. Myron C Waddell (1932): "Process of purifying technical sodium pyrosilicate hydrates". US patent US1931364A.
  2. J. F. Schairer and N. L. Bowen (1956): "The system Na
    2
    O
    Al
    2
    O
    3
    SiO
    2
    ". American Journal of Science, volume 254, issue 3, pages 129-195 doi : 10.2475/ajs.254.3.129
  3. Volker Kahlenberg, Thomas Langreiter, and Erik Arroyabe (2010): "Na6Si2O7 – The Missing Structural Link among Alkali Pyrosilicates". Zeitschrift für anorganishe und allgemeine Chemie (Journal for Inorganic and General Chemistry), volume 636, issue 11, pages 1974-1979. doi : 10.1002/zaac.201000120