سدیم سیلیکات

Substance:Sodium silicate

(Redirected from Sodium silicate)

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• Molecular formula: Na₂O₃Si
• Molar mass: 123.071
• CAS Registry Number: Not available
• Appearance: Sodium metasilicate, anhydrous, tech.; Sodium metasilicate, anhydrous, tech.; colourless liquid as usually supplied (solution)
• Melting point: 1088
• Boiling point: Not available
• Solubility: Soluble in cold water. Hydrolyzes in hot water
• Safety sheet: Not available
• Spectra: Check on SDBS. Add Spectra (Help).

From Wikipedia

Sodium silicate is the common name for compounds with the formula Na₂(SiO₂)_nO. A well-known member of this series is sodium metasilicate, Na₂SiO₃. Also known as waterglass or liquid glass, these materials are available in aqueous solution and in solid form. The pure compositions are colourless or white, but commercial samples are often greenish or blue owing to the presence of iron-containing impurities.

They are used in cements, passive fire protection, textile and lumber processing, refractories, and automobiles. Sodium carbonateand silicon dioxide react when molten to form sodium silicate and carbon dioxide:

Na₂CO₃ + SiO₂ → Na₂SiO₃ + CO₂

Anhydrous sodium silicate contains a chain polymeric anion composed of corner-shared {SiO₄} tetrahedral, and not a discrete SiO₃²⁻ ion.

In industry, the various grades of sodium silicate are characterized by their SiO₂:Na₂O weight ratio (weight ratios can be converted to molar ratios by multiplication with 1.032), which can vary between 2:1 and 3.75:1. Grades with this ratio below 2.85:1 are termed alkaline. Those with a higher SiO₂:Na₂O ratio are described as neutral.

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Other names

Disodium oxosilanediolate (IUPAC Name); Disodium salt oxo-silanediolate; sodium metasilicate