| Revision as of 12:11, 15 February 2012 editBeetstra (talk | contribs)Edit filter managers, Administrators172,031 edits Saving copy of the {{chembox}} taken from revid 476791708 of page Sodium_silicate for the Chem/Drugbox validation project (updated: ''). |
Latest revision as of 14:13, 24 January 2024 edit Maxim Masiutin (talk | contribs)Extended confirmed users, IP block exemptions, Pending changes reviewers31,050 edits Used lowercase "cite" template everywhere for consistency. |
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{{ambox | text = This page contains a copy of the infobox ({{tl|chembox}}) taken from revid of page ] with values updated to verified values.}} |
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{{Chembox |
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{{Chembox |
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| verifiedrevid = 464403969 |
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| verifiedrevid = 476992453 |
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| ImageFileL1 = Sodium-metasilicate-repeating-unit-2D.png |
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| ImageFile1 = Na2SiO3idealized.png |
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| ImageFileL1_Ref = {{chemboximage|correct|??}} |
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| ImageSize1 = 244 |
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| ImageSizeL1 = 121 |
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| ImageNameL1 = Structural formula of polymeric sodium silicate |
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| ImageName1 = Structural formula of polymeric sodium silicate |
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| ImageFileR1 = Sodium-metasilicate-chain-from-xtal-3D-balls.png |
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| ImageFile2 = Sodium-metasilicate-chain-from-xtal-3D-balls.png |
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| ImageFileR1_Ref = {{chemboximage|correct|??}} |
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| ImageFile2_Ref = {{chemboximage|correct|??}} |
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| ImageSize2 = 244 |
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| ImageSizeR1 = 121 |
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| ImageNameR1 = Ball and stick model of polymeric sodium silicate |
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| ImageName2 = Ball and stick model of polymeric sodium silicate |
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| ImageFile2 = Křemičitan sodný.PNG |
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| ImageFile3 = Křemičitan sodný.PNG |
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| ImageFile2_Ref = {{chemboximage|correct|??}} |
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| ImageFile3_Ref = {{chemboximage|correct|??}} |
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| ImageSize2 = 244 |
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| ImageSize3 = 244 |
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| ImageName2 = Sample of sodium silicate in a vial |
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| ImageName3 = Sample of sodium silicate in a vial |
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| IUPACName = Sodium metasilicate |
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| IUPACName = Sodium metasilicate |
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| OtherNames = Liquid glass<br /> |
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| OtherNames = |
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| Section1 = {{Chembox Identifiers |
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Waterglass |
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| index1_label = pentahydrate |
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| Section1 = {{Chembox Identifiers |
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| index2_label = nonahydrate |
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| Abbreviations = E550 |
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| Abbreviations = E550 |
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| CASNo = 6834-92-0 |
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| CASNo = 6834-92-0 |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| PubChem = 23266 |
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| CASNo1 = 10213-79-3 |
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| CASNo2 = 13517-24-3 |
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| PubChem_Ref = {{Pubchemcite|correct|pubchem}} |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| ChemSpiderID = 21758 |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| CASNo2_Ref = {{cascite|correct|CAS}} |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| EINECS = 229-912-9 |
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| UNII = 052612U92L |
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| UNNumber = 3253 |
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| UNII2_Ref = {{fdacite|correct|FDA}} |
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| MeSHName = Sodium+metasilicate |
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| RTECS = VV9275000 |
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| UNII2 = D8D44215LZ |
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| PubChem = 23266 |
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| ChEBI_Ref = {{ebicite|correct|EBI}} |
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| PubChem1 = 61495 |
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| PubChem2 = 61639 |
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| ChemSpiderID = 21758 |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| EINECS = 600-279-4 |
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| EC_number = 229-912-9 |
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| RTECS = VV9275000 |
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| UNNumber = 1759 3253 |
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| MeSHName = Sodium+metasilicate |
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| ChEBI_Ref = {{ebicite|correct|EBI}} |
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| ChEBI = 60720 |
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| ChEBI = 60720 |
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| SMILES = ..()=O |
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| SMILES = ..()=O |
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| StdInChI=1S/2Na.O3Si/c;;1-4(2)3/q2*+1;-2 |
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| StdInChI = 1S/2Na.O3Si/c;;1-4(2)3/q2*+1;-2 |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChI_Ref = {{stdinchicite|correct|chemspider}} |
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| InChI = 1/2Na.O3Si/c;;1-4(2)3/q2*+1;-2 |
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| InChI = 1/2Na.O3Si/c;;1-4(2)3/q2*+1;-2 |
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| StdInChIKey = NTHWMYGWWRZVTN-UHFFFAOYSA-N |
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| StdInChIKey = NTHWMYGWWRZVTN-UHFFFAOYSA-N |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} |
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| InChIKey = NTHWMYGWWRZVTN-UHFFFAOYAB |
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| InChIKey = NTHWMYGWWRZVTN-UHFFFAOYAB |
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}} |
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}} |
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| Section2 = {{Chembox Properties |
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| Section2 = {{Chembox Properties |
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| Na = 2 |
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| Na=2 | O=3 | Si=1 |
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| Formula = Na<sub>2</sub>SiO<sub>3</sub> |
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| O = 3 |
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| Appearance = White crystals |
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| Si = 1 |
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| ExactMass = 121.941209749 g mol<sup>-1</sup> |
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| Density = 2.61 g/cm<sup>3</sup> |
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| MeltingPtC = 1088<!-- or 1089?--> |
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| Appearance = White, opaque crystals |
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| RefractIndex = 1.52 |
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| Density = 2.4 g cm<sup>-3</sup> |
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| Solubility = 22.2 g/100 ml (25 °C) <br> 160.6 g/100 ml (80 °C) |
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| MeltingPtC = 1088 |
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| SolubleOther = insoluble in ] |
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| RefractIndex = 1.52 |
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}} |
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}} |
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| Section3 = {{Chembox Thermochemistry |
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| Section3 = {{Chembox Thermochemistry |
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| DeltaHf = −1561.43 kJ mol<sup>-1</sup> |
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| DeltaHf = −1561.43 kJ/mol |
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| DeltaGf = −1427 kJ/mol |
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| Entropy = 113.71 J K<sup>−1</sup> mol<sup>−1</sup> |
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| Entropy = 113.71 J/(K·mol) |
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}} |
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| HeatCapacity = 111.8 J/(K·mol) |
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| Section4 = {{Chembox Hazards |
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}} |
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| ExternalMSDS = |
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| Section4 = {{Chembox Hazards |
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| EUIndex = 014-010-00-8 |
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| ExternalSDS = |
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| EUClass = {{Hazchem C}} |
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| NFPA-H = 2 |
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| NFPA-H = 2 |
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| NFPA-F = 0 |
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| NFPA-F = 0 |
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| NFPA-R = 0 |
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| NFPA-R = 0 |
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| LD50 = 1153{{clarify|reason=units?|date=January 2017}} (rat, oral) |
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| RPhrases = {{R34}}, {{R37}} |
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| GHSPictograms = {{GHS05}}{{GHS07}} |
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| SPhrases = {{S1/2}}, {{S13}}, {{S24/25}}, {{S36/37/39}}, {{S45}} |
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| GHSSignalWord = Danger |
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}} |
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| HPhrases = {{H-phrases|302|314|315|319|335}} |
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| Section8 = {{Chembox Related |
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| PPhrases = {{P-phrases|260|261|264|270|271|280|301+312|301+330+331|302+352|303+361+353|304+340|305+351+338|310|312|321|330|332+313|337+313|362|363|403+233|405|501}} |
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| OtherAnions = ] |
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}} |
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| OtherCations = ] |
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}} |
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'''Sodium metasilicate''' is the ] with formula {{chem|Na|2|SiO|3}}, which is the main component of commercial ] solutions. It is an ] consisting of ] ]s {{chem|Na|+}} and the ]ic ] ]s <sub>''n''</sub>. It is a colorless crystalline ] and ] solid, soluble in water (giving an alkaline solution) but not in alcohols.<ref name=chembook>Chemical Book: . Accessed on 2018-05-13.</ref> |
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==Preparation and properties== |
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The ] compound can be prepared by fusing ] {{chem|SiO|2}} (silica, ]) with ] {{chem|Na|2|O}} in 1:1 molar ratio.<ref name=sche>J. F. Schairer and N. L. Bowen (1956): "The system {{chem|Na|2|O}}—{{chem|Al|2|O|3}}—{{chem|SiO|2}}". ''American Journal of Science'', volume 254, issue 3, pages 129-195 {{doi|10.2475/ajs.254.3.129}}</ref> |
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The compound crystallizes from solution as various ]s, such as |
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* pentahydrate {{chem|Na|2|SiO|3}}·5{{chem|H|2|O}} (CAS 10213-79-3, EC 229-912-9, PubChem 57652358) |
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* nonahydrate {{chem|Na|2|SiO|3}}·9{{chem|H|2|O}} (CAS 13517-24-3, EC 229-912-9, PubChem 57654617)<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> |
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==Structure== |
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In the anhydrous solid, the metasilicate anion is actually polymeric, consisting of corner-shared {SiO<sub>4</sub>} tetrahedra, and not a discrete SiO<sub>3</sub><sup>2− </sup> ion.<ref name = "Greenwood">{{Greenwood&Earnshaw}}</ref> |
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In addition to the anhydrous form, there are hydrates with the formula Na<sub>2</sub>SiO<sub>3</sub>·''n''H<sub>2</sub>O (where ''n'' = 5, 6, 8, 9), which contain the discrete, approximately tetrahedral anion SiO<sub>2</sub>(OH)<sub>2</sub><sup>2−</sup> with water of hydration. For example, the commercially available sodium silicate pentahydrate Na<sub>2</sub>SiO<sub>3</sub>·5H<sub>2</sub>O is formulated as Na<sub>2</sub>SiO<sub>2</sub>(OH)<sub>2</sub>·4H<sub>2</sub>O, and the nonahydrate Na<sub>2</sub>SiO<sub>3</sub>·9H<sub>2</sub>O is formulated as Na<sub>2</sub>SiO<sub>2</sub>(OH)<sub>2</sub>·8H<sub>2</sub>O.<ref>Wells A.F. (1984) ''Structural Inorganic Chemistry'' 5th edition Oxford Science Publications {{ISBN|0-19-855370-6}}</ref> The pentahydrate and nonahydrate forms have their own CAS Numbers, and respectively. |
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==Uses== |
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Sodium Metasilicate reacts with acids to produce ].<ref>{{cite web|url=https://sciencing.com/uses-sodium-metasilicate-5447484.html|title = Uses of Sodium Metasilicate}}</ref> |
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* Cements and Binders - dehydrated sodium metasilicate forms cement or binding agent. |
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* Pulp and Par - sizing agent and buffer/stabilizing agent when mixed with hydrogen peroxide. |
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* Soaps and Detergents - as an emulsifying and suspension agent. |
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* Automotive applications - decommissioning of old engines (CARS program), cooling system sealant, exhaust repair. |
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* Egg Preservative - seals eggs increasing shelf life. |
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* Crafts - forms "stalagmites" by reacting with and precipitating metal ions. Also used as a glue called "]". |
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* ] kits |
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==See also== |
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* ] |
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* ] |
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* ] |
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==References== |
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{{Reflist}} |
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{{Authority control}} |
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] |
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] |
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] |