Sodium metasilicate
Sodium metasilicate is the chemical substance with formula Na
2SiO
3, which is the main component of commercial sodium silicate solutions. It is an ionic compound consisting of sodium cations Na+
and the polymeric metasilicate anions [–SiO2−
3–]n. It is a colorless crystalline hygroscopic and deliquescent solid, soluble in water (giving an alkaline solution) but not in alcohols.
| Names | |
|---|---|
| IUPAC name
Sodium metasilicate | |
| Identifiers | |
| |
3D model (JSmol) |
|
| Abbreviations | E550 |
| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.027.193 |
| EC Number |
|
| MeSH | Sodium+metasilicate |
PubChem CID |
|
| RTECS number |
|
| UNII |
|
| UN number | 1759 3253 |
CompTox Dashboard (EPA) |
|
| |
| |
| Properties | |
| Na2SiO3 | |
| Molar mass | 122.062 g·mol−1 |
| Appearance | White crystals |
| Density | 2.61 g/cm3 |
| Melting point | 1,088 °C (1,990 °F; 1,361 K) |
| 22.2 g/100 ml (25 °C) 160.6 g/100 ml (80 °C) | |
| Solubility | insoluble in alcohol |
Refractive index (nD) |
1.52 |
| Thermochemistry | |
Heat capacity (C) |
111.8 J/(K·mol) |
Std molar entropy (S⦵298) |
113.71 J/(K·mol) |
Std enthalpy of formation (ΔfH⦵298) |
−1561.43 kJ/mol |
Gibbs free energy (ΔfG⦵) |
−1427 kJ/mol |
| Hazards | |
| GHS labelling: | |
| Danger | |
| H302, H314, H315, H319, H335 | |
| P260, P261, P264, P270, P271, P280, P301+P312, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P330, P332+P313, P337+P313, P362, P363, P403+P233, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
1153 (rat, oral) |
| Safety data sheet (SDS) | Avantor Performance Materials |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.