| Identification | More | [Name]
Sodium metasilicate | [CAS]
6834-92-0 | [Synonyms]
Disodium metasilicate
DISODIUM TRIOXOSILICATE
SILICA STANDARD
SODIUM METASILICATE
SODIUM METASILICATE N-HYDRATE
SODIUM-M-SILICATE
SODIUM SESQUISILICATE
SODIUM SILICATE
SODIUM SILICATE, META
WATER GLASS
anhydroussodiummetasilicate
B-W
Crystamet
Crystamet 1020
Disodium monosilicate
Disodium silicon trioxide
disodiummonosilicate
Drymet 59
Lasilso
Metso | [EINECS(EC#)]
215-687-4 | [Molecular Formula]
Na2O3Si | [MDL Number]
MFCD00003492 | [Molecular Weight]
122.06 | [MOL File]
6834-92-0.mol |
| Chemical Properties | Back Directory | [Definition]
A crystalline silicate.
| [Appearance]
White, granular powder. Soluble in
water; p H of 1% solution 12.7. Noncombustible.
| [Melting point ]
1089°C | [density ]
2.4 | [refractive index ]
nD25 (glass) 1.520 | [solubility ]
soluble in cold H2O; reachot H2O; insoluble in ethanol | [form ]
powder
| [color ]
White | [Specific Gravity]
2.61 | [PH]
11(1 mM solution);11.91(10 mM solution);12.62(100 mM solution) | [Water Solubility ]
Soluble in cold water. Hydrolyzes in hot water. Insoluble in acids, alcohol and salt solutions. | [Hydrolytic Sensitivity]
0: forms stable aqueous solutions | [Merck ]
14,8642 | [Stability:]
hygroscopic | [InChIKey]
NTHWMYGWWRZVTN-UHFFFAOYSA-N | [Uses]
Laundry, dairy, and metal cleaning; floor clean-
ing; base for detergent formulations; bleaching aid;
deinking paper. Also available as the pentahydrate
whose properties are mp 72.2C, total Na
2
O content
29.3%, total Na
2
O in active form 27.8%, d 1.75 or
55 lb/cu ft. | [CAS DataBase Reference]
6834-92-0(CAS DataBase Reference) | [NIST Chemistry Reference]
Sodium silicate(6834-92-0) | [EPA Substance Registry System]
6834-92-0(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
C | [Risk Statements ]
R36/37/38:Irritating to eyes, respiratory system and skin .
R37:Irritating to the respiratory system.
R34:Causes burns. | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S13:Keep away from food, drink and animal feeding stuffs .
S24/25:Avoid contact with skin and eyes . | [RIDADR ]
UN 3253 8/PG 3
| [WGK Germany ]
1
| [RTECS ]
VV9275000
| [F ]
3 | [TSCA ]
Yes | [HazardClass ]
8 | [PackingGroup ]
III | [HS Code ]
28391910 | [Safety Profile]
Poison by ingestion and intraperitoneal routes. A caustic material whch is a severe eye, sktn, and mucous membrane irritant. Experimental reproductive effects. Ingestion causes gastrointestinal tract upset. Violent reaction with F2. When heated to decomposition it emits toxic fumes of Na2O. Used in cosmetics. See also SILICATES. | [Hazardous Substances Data]
6834-92-0(Hazardous Substances Data) |
| Hazard Information | Back Directory | [Hazard]
Toxic by ingestion, protective clothing
required.
| [Chemical Properties]
The metasilicates are highly water soluble, but insoluble in
alcohol, acid, and salt solutions. Solutions of sodium metasilicate,
when heated or acidified, are hydrolyzed to free sodium
ions and silicic acid. In moist air, they are corrosive to metals,
including zinc, aluminum, tin, and lead, forming hydrogen
gas. They are all strong bases reacting violently with acid. | [Chemical Properties]
White, granular powder. Soluble in
water; p H of 1% solution 12.7. Noncombustible.
| [Flammability and Explosibility]
Notclassified | [Purification Methods]
Crystallise it from aqueous 5% NaOH solution. [Schwartz Z Anorg Allgem Chem 126 62 1923.] |
| Questions And Answer | Back Directory | [Overview]
Sodium metasilicate is a type of silicic acid salt and is classified as an inorganic salt products, and its molecular formula is Na2SiO3•nH2O. It is a non-toxic, odorless and harmless white powder or crystalline particle. It is soluble in water, but not in alcohols or acids. Its aqueous solution is alkaline and is capable of hygroscopy and deliquescence when in contact with air. It has purifying, emulsifying, dispersing, moistening, permeating and PH buffering abilities. Sodium metasilicate is a low molecular weight crystal that results from the heat reaction between foaming alkaline and caustic soda water. Products include anhydrous, pentahydrate and nonahydrate compounds.
Among inorganic electrolytes, sodium metasilicate’s active alkalinity and PH buffering index is the highest. It has strong moistening, emulsifying and saponifying effect on fats. It is excellent at eliminating, dispersing and suspending impurities, and it can prevent impurities from recollecting. It has strong cleansing, buffering and neutralizing abilities, can emulsify fats and oils, is an anti-flocculant for inorganic matter, protects metals from erosion, can replace sodium tripolyphosphate in producing detergents and metal cleansing agents, thus reducing the environmental pollution of sodium tripolyphosphate.
Sodium metasilicate is widely used in laundry detergent, ceramics, plating, textiles, printing, papermaking, concrete, cement, fireproof materials, oils, leather processing, and many other industrial fields. Currently, the industries that use it the most are: ceramics, industrial cleaning, laundry detergent, concrete, printing, papermaking, cement, oil mining, etc.
| [Identifying tests]
Dissolve a 200mg sample in 10ml water and dispense a drop of this liquid onto a color palette. Add 1 drop of 4mol/L sodium hydroxide and one drop of a solution of 0.5g of ammonium molybdate in 10ml water. Then add 3ml sulfuric acid, and it should turn dark yellow to indicate the presence of silicate. Dip a nichrome wire into the test solution of experiment 1 and place it in a flame; it should turn bright yellow to indicate the presence of sodium.
| [Content Analysis]
Take a 1g sample of silica, place it in a beaker, use 5ml hydrochloric acid to acidify it, and evaporate on a steam bath until dry. Then add another 5ml hydrochloric acid and repeat the steps once. Mix the remainder with 1ml hydrochloric acid and 2ml water, hydrolyze into a soluble salt on the steam bath, and strain through a quantitative analysis filter paper. After rinsing with hot water, move to a platinum crucible and dry for 1h at 105℃, and use a lower temperature to carbonize. Then burn at 1000℃ until it maintains a constant weight. Use a few drops of water to moisten the remainder, and then add 15ml hydrofluoric acid and 5 drops of 1:3 sulfuric acid. After removing the acid on a hot plate, burn at 1000℃ until it maintains a constant weight.
| [Toxicity]
Corrosive; do not contact with eyes, skin or clothes, and do not inhale its vapor.
GRAS(GMP；FDA，§184.1769a，2000).
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