HYDRATED SILICA
Hydrated silica is fundamental to the Earth's geochemical cycles, playing a critical role in the weathering of silicate rocks, the formation of clays, and the transport of silicon in natural water systems.
Hydrated silica's ability to polymerize and form networks is critical in understanding the sol-gel process, a method used to produce advanced materials with controlled porosity and surface properties.
In biological systems, Hydrated silica serves as a precursor for biomineralization processes, aiding in the formation of silica-based structures in organisms like diatoms, radiolarians, and sponges.
CAS Number: 1343-98-2
EC Number: 215-683-2
Molecular Formula: H2O3Si
Molecular Weight: 78.1
Synonyms: K 60, G 952, bio-sil, K 320DS, Cubosic, H-Ilerit, Neoxyl ET, Zeosil 45, Sizol 030, Sipernat S, Mikronisil, Sipernat 17, Silica acid, metasilicic, SILICA ACID, Sipernat 50, kieselsaure, Silton TF 06, Sipernat 50S, Silicic acid, Sipernat D 10, Silicic acid, HYDRATED SILICA, K 60 (silicate), metaSilicic acid, EINECS 215-683-2, PolySilicic acid, Hydrosilisic acid, Silicon hydroxide, PRECIPITATED SILICA, silicicacid(h2sio3), Silicic acid hydrate, PolyorthoSilicic acid, Silicic acid (polyortho), EPA Pesticide Chemical Code 072602, Silicicacid mesh for chromatography, Silicic acid suitable for column chromatography, 60-200 mesh, pentahydroxydisiloxanyl trihydrogen orthosilicate (non-preferred name)
Hydrated silica is a general term for a family of chemical compounds containing silicon, oxygen, and hydrogen, often represented by the formula SiOₓ(OH)₄₋₂.
Hydrated silicas are weak acids and are typically not isolated in their pure form but exist as solutions or as components of silicate minerals.
Hydrated silicas are highly hydrated and can polymerize, forming complex structures such as chains, sheets, or three-dimensional frameworks, which are the basis of many silicate minerals and materials like glasses and ceramics.
In aqueous solutions, Hydrated silica exists primarily in a monomeric form at low concentrations, but as the concentration increases, it tends to form colloidal particles or gels due to condensation reactions.
Hydrated silica plays a significant role in geological and biological processes.
In geology, Hydrated silica is involved in the formation of minerals and rocks, while in biology, it contributes to the formation of diatom shells and sponges' skeletons.
Hydrated silica is also important in water treatment and industrial applications, where it is used to remove impurities or as a precursor for silica-based materials.
Despite its relatively simple composition, Hydrated silica exhibits complex behavior due to its tendency to polymerize and form various hydrated forms, which makes it a subject of interest in both scientific research and practical applications.
Hydrated silica is a chemical compound, a feebly acidic colloidal hydrated type of silica made by acidifying arrangements of alkali metal silicates.
Hydrated silica is a compound of Silicon, Oxygen, and Hydrogen viewed as the parent substance from which is inferred a huge family - the silicate - of minerals, salts, and the Hydrated silica Ester.
The general formula of Hydrated silica is [SiO x (OH)4 − 2x] n, and the Hydrated silica formula is Si (OH)4 or H4SiO4 name.
The silicate or Hydrated silica formula is H4SiO4, it is a vital supplement in the sea.
Unlike other significant supplements like phosphate, nitrate, or ammonium, which are required by practically all marine microscopic fish, silicate is a fundamental chemical prerequisite just for certain biotas like diatoms, radiolaria, silicoflagellates, and siliceous sponges.
The broken-down silicate in the sea is changed over by these different plants and creatures into particulate silica (SiO2), which serves fundamentally as underlying material (i.e., the biota's hard parts).
Hydrated silica is a compound of silicon, oxygen and hydrogen and is considered the parent substance from which a large family of silicates, consisting of minerals, salts and esters, is derived.
The acid itself, with the formula Si(OH) 4, can only be prepared as an unstable solution in water; Hydrated silica's molecules condense easily with each other to form polymeric chains, rings, sheets or three-dimensional networks that form the structural units of water and silica gel (q.v.) and many minerals with very low solubility in water.
Various esters of Hydrated silica, made from alcohols and silicon tetrachloride, are thermally stable liquids used as lubricants and hydraulic fluids.
Hydrated silica is a natural compound of silicium, water and oxygen.
Hydrated silica is obtained from the cell wall of diatoms, a group of algae.
Hydrated silica is a compound of interest primarily in the fields of materials science and geochemistry.
Hydrated silica is frequently studied for its role in the formation of silica-based materials, such as glasses, ceramics, and zeolites.
Hydrated silica′s ability to polymerize and form networks is critical in understanding the sol-gel process, a method used to produce advanced materials with controlled porosity and surface properties.
In geochemical research, Hydrated silica hydrate is examined for its involvement in the biogeochemical cycling of silicon, as well as its contribution to the formation of natural silicate minerals and diatom frustules.
Environmental scientists also utilize Hydrated silica hydrate to explore the mobility of silicon in soils and aquatic systems, and its interaction with other elements and minerals.
Hydrated silica's role in regulating the bioavailability of silicon, an essential nutrient for certain organisms, is another aspect examined in ecological studies.
Through these diverse applications, Hydrated silica hydrate provides insights into both synthetic processes and natural phenomena.
In chemistry, a Hydrated silica is any chemical compound containing the element silicon attached to oxide (=O) and hydroxyl (−OH) groups, with the general formula [H2xSiOx+2]n or, equivalently, [SiOx(OH)4−2x]n.
Hydrated silica is a representative example. Hydrated silicas are rarely observed in isolation, but are thought to exist in aqueous solutions, including seawater, and play a role in biomineralization.
They are typically colorless weak acids that are sparingly soluble in water.
Like the silicate anions, which are their better known conjugate bases, Hydrated silicas are proposed to be oligomeric or polymeric.
No simple Hydrated silica has ever been identified, since these species are primarily of theoretical interest.
Depending on the number of silicon atoms present, there are mono- and polysilicic (di-, tri-, tetrasilicic, etc.) acids.
Well defined Hydrated silicas have not been obtained in a form that has been characterized by X-ray crystallography.
Hydrated silica, though simple in its basic chemical composition, holds immense complexity due to its dynamic nature in aqueous environments and its tendency to form polymeric structures.
Hydrated silica's general chemical formula, SiOₓ(OH)₄₋₂, allows it to exist in various forms depending on factors like pH, temperature, and concentration.
In dilute solutions, Hydrated silica typically exists as orthoHydrated silica (H₄SiO₄), a weak, monoprotic acid that readily interacts with its surroundings.
However, as the concentration increases or the pH changes, Hydrated silica undergoes polymerization, leading to the formation of dimers, trimers, and eventually complex silicate networks.
These networks can precipitate out as silica gel, an amorphous, hydrated form of silicon dioxide, or further crystallize into more structured forms.
Hydrated silica is fundamental to the Earth's geochemical cycles, playing a critical role in the weathering of silicate rocks, the formation of clays, and the transport of silicon in natural water systems.
Hydrated silica's solubility is influenced by temperature and pH, with higher temperatures and alkaline conditions promoting the dissolution of silicates into Hydrated silica.
In biological systems, Hydrated silica serves as a precursor for biomineralization processes, aiding in the formation of silica-based structures in organisms like diatoms, radiolarians, and sponges.
These structures are essential for their survival, providing mechanical support and protection.
Industrial applications of Hydrated silica are equally diverse.
Hydrated silica is a crucial intermediate in producing silica-based materials such as glasses, ceramics, and zeolites.
In water treatment processes, Hydrated silica is used to remove heavy metals and other impurities due to its ability to form stable complexes.
Additionally, Hydrated silica is employed in the synthesis of advanced materials like silica aerogels and nanoparticles, which are used in insulation, catalysis, and drug delivery systems.
Hydrated silica's behavior is influenced by its interaction with other ions and compounds.
For example, in the presence of aluminum, Hydrated silica can form aluminosilicates, which are the basis of feldspars and clays.
Hydrated silica's ability to polymerize and form gels makes it invaluable in various fields, from geology and environmental science to materials engineering and biotechnology.
Understanding Hydrated silica's properties and reactivity continues to be a focus of research, with implications for advancing sustainable technologies and exploring the origins of life on Earth.
Applications of Hydrated Silica:
Hydrated silica has a wide range of applications across various scientific, industrial, and environmental fields due to its unique chemical and physical properties.
In the industrial sector, Hydrated silica serves as a precursor for the production of silica-based materials such as glasses, ceramics, and zeolites, which are essential in construction, electronics, and catalysis.
Hydrated silica's ability to polymerize and form stable gels makes it a key component in the manufacturing of silica aerogels, which are renowned for their exceptional insulation, lightweight properties, and use in aerospace, thermal insulation, and advanced engineering.
In water treatment processes, Hydrated silica plays a vital role in removing heavy metals and other contaminants by forming complexes or precipitates, contributing to cleaner water systems.
In biotechnology, Hydrated silica is used to produce silica nanoparticles, which have applications in drug delivery systems, bioimaging, and diagnostics.
Geochemically, Hydrated silica is fundamental in soil chemistry, contributing to the formation of clays and influencing nutrient availability in agriculture.
Hydrated silica's natural role in biomineralization is also exploited in research on diatomaceous earth, which has uses in filtration, abrasives, and as a mild insulating material.
Furthermore, Hydrated silica is studied for its potential in carbon sequestration and sustainable technologies, as it is involved in the natural weathering processes that capture CO₂.
Hydrated silica's versatility and reactivity continue to inspire advancements in green chemistry, nanotechnology, and environmental remediation efforts, cementing its importance in modern scientific and technological innovations.
Traditionally, Silica is used as a food supplement, for the prevention of brittle hair and nails, and for strengthening the connective tissue.
Uses of Hydrated Silica:
Hydrated silica is used as a variety of industrial gas desiccant and equipment, equipment, drugs and food, etc.
In the laboratory, factory workshop and public places as air humidity regulator and environmental relative humidity indicator.
Hydrated silica is used as ion exchanger in water treatment industry.
Hydrated silica is used for refining and separating products and dehydration and refining of organic products in petrochemical industry.
In phthalic anhydride, aniline, maleic anhydride, acrylonitrile and cis-polybutadiene rubber and other chemical products used in the production of catalysts and carriers.
In the atmospheric monitoring used as a carrier of toxic gases and chromatographic carriers.
Hydrated silica is widely used across multiple fields due to its versatile properties.
Here are Hydrated silica's key uses:
Industrial Applications:
A precursor for producing silica-based materials like glass, ceramics, and zeolites.
Hydrated silica is used in manufacturing silica aerogels, valued for their lightweight and insulating properties.
A component in coatings, adhesives, and sealants to enhance durability and thermal resistance.
Water Treatment:
Hydrated silica removes heavy metals and impurities by forming complexes or precipitates.
Hydrated silica acts as a flocculant in wastewater treatment systems.
Biotechnology and Medicine:
Hydrated silica is used to create silica nanoparticles for drug delivery, bioimaging, and diagnostics.
Explored for developing biocompatible materials in medical applications.
Geochemical and Environmental Applications:
Plays a role in soil chemistry, influencing clay formation and nutrient availability in agriculture.
Studied for Hydrated silica's role in carbon sequestration during natural silicate weathering.
Biological and Natural Uses:
Essential for biomineralization in organisms like diatoms, sponges, and radiolarians.
Exploited in the production of diatomaceous earth for filtration, abrasives, and insulation.
Advanced Materials:
Hydrated silica is used in developing silica-based nanomaterials for catalysis, energy storage, and sustainable technologies.
Hydrated silica aids in creating high-performance composites for aerospace and engineering.
Toothpaste:
Hydrated silica is the grating gel utilized in the toothpaste, or free piece of the streaked toothpaste, on the grounds that in a mix with calcium carbonate, serves to securely eliminate the plaque with brushing.
Hydrated silica is enrolled as a protected compound in the United States Food and Drug Administration and has no known harmfulness or cancer-causing nature.
Desiccant:
At the point when dried in a broiler, Hydrated silica loses water and turns into a desiccant (a substance that pulls in water from the air).
Little bundles of silica gel precious stones along these lines can be found in compartments whose substance might be harmed by dampness, for example, nutrient jugs, gadgets, shoes, or cowhide items.
Other Uses:
Hydrated silica tends to be found in blessing shops like enchantment stones, compound nursery, or glass garden.
Hydrated silica's dry structure is blended in with salts of various metals.
When delivered into the water, sodium is supplanted by metal, and as the metal silicate isn't dissolvable in water, encouragement of the trademark shade of the metal is framed.
The metal silicate likewise extends as a gel and develops as bright stalagmites in the water.
Advantages of Hydrated Silica:
Health Advantages:
Hydrated silica is the best bioavailable mode of silicon for people.
This can be utilized to treat different ailments like Alzheimer illness, Arthritis, atherosclerosis, hypertension, coronary illness, osteoporosis, stroke and hair.
Bone Health:
In an investigation of 136 ladies with osteopenia in 2008, Hydrated silica was given alongside calcium and nutrient D Or fake treatment consistently for a year.
After the year, members who got the corrosive showed improved bone development.
Researchers say this is because of the capacity of Hydrated silica to invigorate the creation of Collagen (A protein found in connective tissue) and in advancing the advancement of bone-framing cells.
Health in the Hair:
A little report distributed in 2007 recommends that this corrosive can help improve hair quality and wellbeing.
In the examination, 48 ladies with "fine hair" were isolated into two gatherings and given a fake treatment or an Hydrated silica supplement for a very long time.
Scientists found that Hydrated silica seemed to build hair strength and thickness.
Overall the nature of hair has additionally been improved with supplementation of Hydrated silica.
Reactions of Hydrated Silica:
Hydrated silicas can be seen as hydrated forms of silica, namely 2 H2xSiOx+2 = SiO2·(H2O)x.
Indeed, in concentrated solutions, Hydrated silicas generally polymerize and condense, and ultimately degrade to silicon dioxide and water.
The intermediate stages may be very thick liquids or gel-like solids.
Dehydrating the latter yields a hard translucent form of silica with atomic-scale pores, called silica gel, which is widely used as water absorbent and drying agent.
Silica dissolves very sparingly in water and is present in seawater at concentrations below 100 parts per million.
In such dilute solutions, silica is assumed to exist as Hydrated silica.
Theoretical computations indicate that the dissolution of silica in water proceeds through the formation of a SiO2·2H2O complex and then Hydrated silica.
The silicon–oxygen double bond of metaHydrated silica, implied by the formula H2SiO3, is hypothetical or highly unstable.
Such double bonds can be hydrated to a pair of hydroxyl (−OH) groups:
=Si=O + H2O <-> =Si(-OH)2
For example:
H2SiO3+H2O<->H4SiO4
or
H2Si2O5+2H2O<->(HO)3Si-O-Si(OH)3
Alternatively, metaHydrated silica is liable to form cyclic polymers [−SiO(OH)2−]n, which can be opened by hydration to chain polymers HO[−SiO(OH)2−]nH.
Similarly, diHydrated silica is liable to form complex polymers with a tetravalent unit, [=Si2O3(OH)2=]n.
Conversely, oligomeric and polymeric acids may depolymerize by hydrolysis of the Si−O−Si bridges, or such bridges may be created by condensation:
≡Si-O-Si + H2O <-> Si-OH + HO-Si≡
Like organic silanols, Hydrated silicas are weak acids.
Hydrated silica has calculated dissociation potentials pKa1 = 9.84, pKa2 = 13.2 at 25 °C.
Hydrated silicas and silicates in solution react with molybdate anions, yielding yellow silicomolybdate complexes.
This reaction has been used to titrate the content of silicon in water solutions and determine their nature.
In a typical preparation, monomeric Hydrated silica was found to react completely in 75 seconds, dimeric pyroHydrated silica in 10 minutes, and higher oligomers in considerably longer time.
The reaction is not observed with colloidal silica.
The degree of polymerization of Hydrated silicas in water solution can be determined by its effect on the freezing point of the solution (cryoscopy).
Properties of Hydrated Silica:
Physical Properties:
Hydrated silica exists in two states, crystalline and amorphous.
The first is acquired by a precipitation interaction and the second is introduced as a rock gem.
Hydrated silica in its undefined structure (SiO3) is white, unflavoured, insoluble in water, and doesn't shape for certain atoms of itself some firm plastic mass similarly as with aluminum.
In its translucent state, Hydrated silica isn't broken up by any oxyacids.
At the point when an extremely weakening arrangement of silica arrangement is treated with sulfuric acid, Nitric, or hydrochloric corrosive, silicic corrosive isn't accelerated.
All things considered, Hydrated silica has all the earmarks of being disintegrated in water as a hydrate.
At the point when the solution of an acid or acid is added to a silicate solution, the hydrate is encouraged in a thick structure which when dried and then warmed with high energy turns into an insoluble substance.
Chemical Properties:
The properties below describe how the formation of Hydrated silica or Silicate occurs:
Hydrated silica is very feeble and possibly loses its first proton when moving toward pH 10.
Just 3 reactions with acid that are given under typical physiological states of life are known.
The reaction with itself when the solvency is surpassed to frame shapeless silica hydrate.
Hydrated silica's reaction with the aluminium hydroxide forms aluminium silicate hydroxide.
Reaction with overabundance molybdate forms Heteropolyacids like Silicomolybdate.
Formula of Hydrated Silica:
Hydrated silica is a silicon oxoacid and a conjugate acid of a trihydrogensilicate.
The molecular or chemical formula of Hydrated silica is H4O4Si.
Hydrated silica is a compound of oxygen, hydrogen, and silicon.
Hydrated silica is found in borage.
Hydrated silica can be obtained as an unstable solution in water.
Nature of Hydrated Silica:
The main component of silica gel is silica, which is a kind of amorphous silica, transparent color.
Silicone non-toxic, odorless, acid-resistant, alkali-resistant, solvent-resistant, cooked stability.
Do not dissolve in water and any solvent, chemical stability, in addition to strong alkali, hydrofluoric acid and no reaction with any substance.
Hydrated silica has the characteristics of large specific surface area, high internal porosity and strong adsorption capacity, and is a kind of highly active adsorption material.
The adsorption of moisture in the gas can reach 50% of Hydrated silica's own mass.
And in the air flow with 60% humidity, the amount of moisture adsorbed by microporous silica gel can also reach 24% of the mass of silica gel.
After adsorption of water vapor, silica gel can be regenerated by removing water by cooking desorption.
Various types of silica gel form different microporous structures due to different manufacturing methods.
Preparation of Hydrated Silica:
Crystalline Hydrated silicas can be prepared by removing the sodium cations from solutions of sodium silicates with an ion-exchange resin, or by treating sodium silicates with concentrated sulfuric acid.[10]
Adding acid and electrolyte to the sodium silicate solution, reacting with stirring to generate Hydrated silica gel, and then aging, washing, drying and activating to obtain silica gel.
Different raw material ratio and process conditions can produce different specifications of Hydrated silica.
History of Hydrated Silica:
Hydrated silica was invoked by Jöns Jacob Berzelius in the early 19th century to explain the dissolution of silicon dioxide (silica, quartz) in water, namely through the hydration reaction:
SiO2+H2O<->H2SiO3
Based on the vapor pressure curves for silica gel, Reinout Willem Van Bemmelen argued that no silica hydrates existed, only silica gel.
On the other hand, Gustav Tschermak von Seysenegg believed that he had observed different Hydrated silicas as decomposition products of natural silicate gels.
The first crystalline Hydrated silica was prepared from the phyllosilicate natrosilite (Na2Si2O5) in 1924.
More than 15 crystalline acids are known and comprise at least six modifications of H2Si2O5.
Some acids can adsorb and intercalate organic molecules, and therefore are interesting alternatives to silica.
Handling and Storage of Hydrated Silica:
Handling:
Avoid inhalation, ingestion, or direct skin and eye contact with Hydrated silica solutions or powders.
Use in well-ventilated areas to minimize exposure to vapors or aerosols.
Wear appropriate personal protective equipment (PPE), such as gloves, goggles, and lab coats, to reduce risk.
Do not mix with incompatible materials like strong acids or bases.
Storage:
Store in a cool, dry, and well-ventilated area.
Keep containers tightly sealed to prevent contamination or evaporation.
Protect from excessive heat and freezing conditions, as these may alter Hydrated silica's stability.
Avoid storing near incompatible substances (e.g., oxidizing agents).
Stability and Reactivity of Hydrated Silica:
Stability:
Hydrated silica is stable under standard conditions of temperature and pressure.
In aqueous solutions, Hydrated silica may polymerize over time, forming silica gels.
Hydrated silica decomposes at high temperatures, releasing silicon dioxide.
Reactivity:
Reacts with strong acids and bases, which may result in decomposition or formation of insoluble silicates.
Incompatible with oxidizing agents, which may lead to unwanted reactions.
Non-flammable and non-explosive under normal conditions.
First Aid Measures of Hydrated Silica:
Inhalation:
Move the person to fresh air.
If breathing is difficult, seek medical attention.
Skin Contact:
Wash thoroughly with soap and water.
Remove contaminated clothing.
Seek medical advice if irritation persists.
Eye Contact:
Rinse eyes immediately with plenty of water for at least 15 minutes.
Consult a physician if irritation continues.
Ingestion:
Rinse mouth with water and drink water to dilute.
Do not induce vomiting.
Seek medical attention if symptoms occur.
Firefighting Measures of Hydrated Silica:
Flammability:
Non-flammable.
Suitable Extinguishing Media:
Use water spray, carbon dioxide, foam, or dry powder depending on the surrounding fire.
Specific Hazards:
Heating may result in decomposition and release of silicon dioxide dust.
Protective Equipment:
Firefighters should wear self-contained breathing apparatus (SCBA) and protective gear to avoid inhalation of fumes.
Accidental Release Measures of Hydrated Silica:
Personal Precautions:
Use appropriate PPE, including gloves, goggles, and respiratory protection if necessary.
Ensure proper ventilation to avoid inhaling dust or vapors.
Environmental Precautions:
Prevent material from entering waterways, drains, or soil.
Cleanup Methods:
Contain the spill and use absorbent materials (e.g., sand, earth) to collect the liquid.
Dispose of in accordance with local, regional, or national regulations.
Wash the affected area with water after cleanup.
Exposure Controls/Personal Protective Equipment of Hydrated Silica:
Exposure Limits:
Ensure exposure levels comply with occupational safety standards for silicon compounds.
Engineering Controls:
Use adequate ventilation or local exhaust systems to minimize exposure.
Enclose processes where aerosols or vapors are generated.
Personal Protective Equipment:
Respiratory Protection:
Use a dust mask or respirator when handling powders or aerosols.
Eye Protection:
Wear chemical splash goggles or a face shield.
Skin Protection:
Use chemical-resistant gloves and protective clothing.
General Hygiene:
Wash hands thoroughly after handling and before eating or drinking.
Identifiers of Hydrated Silica:
CAS No: 1343-98-2
CBNumber: CB2199391
Molecular Formula: H2O3Si
Molecular Weight: 78.1
MDL Number: MFCD00054122
CAS Number: 1343-98-2
EC Number: 215-683-2
MDL number: MFCD00054122
UNSPSC Code: 12352301
PubChem Substance ID: 329753291
NACRES: SB.52
CAS Number: 10279-57-9
EC Number: 231-545-4
Hill Formula: H₄O₄Si
Chemical Formula: SiO₂ * x H₂O
Molar Mass: 60.08 g/mol
HS Code: 2811 22 10
Quality Level: MQ200
Formula: H4O4Si
Average Mass: 96.11486
Monoisotopic Mass: 95.98789
InChI: InChI=1S/H4O4Si/c1-5(2,3)4/h1-4H
InChIKey: RMAQACBXLXPBSY-UHFFFAOYSA-N
SMILES: O[Si](O)(O)O
Properties of Hydrated Silica:
Density: 0.230 g/cm3
form: powder
color: White
Odor: Odorless
Water Solubility: Soluble in water.
Merck: 13,8564
Dielectric constant: 2.0（Ambient）
Stability: Stable.
CAS DataBase Reference: 1343-98-2(CAS DataBase Reference)
Indirect Additives used in Food Contact Substances: Hydrated silica
FDA 21 CFR: 177.1200
EWG's Food Scores: 1
FDA UNII: Y6O7T4G8P9
EPA Substance Registry System: Hydrated silica (1343-98-2)
Molecular Weight: 192.23 g/mol
Hydrogen Bond Donor Count: 8
Hydrogen Bond Acceptor Count: 8
Rotatable Bond Count: 0
Exact Mass: 191.97577028 Da
Monoisotopic Mass: 191.97577028 Da
Topological Polar Surface Area: 162 Ų
Heavy Atom Count: 10
Complexity: 19.1
Isotope Atom Count: 0
Defined Atom Stereocenter Count: 0
Undefined Atom Stereocenter Count: 0
Defined Bond Stereocenter Count: 0
Undefined Bond Stereocenter Count: 0
Covalently-Bonded Unit Count: 2
Compound Is Canonicalized: Yes
Quality Level: 200
Assay: 99.9%
form: powder
purified by: refining
particle size: 20 μm
SMILES string: O[Si](O)=O
InChI: 1S/H2O3Si/c1-4(2)3/h1-2H
InChI key: IJKVHSBPTUYDLN-UHFFFAOYSA-N
Specifications of Hydrated Silica:
Assay (gravimetric, SiO₂, calc. on ignited substance): 99.0 - 100.5 %
Identity test: passes
pH value (3.3%, water): 3.0 - 8.0
Chloride (Cl): ≤ 0.05%
Sulfate (SO₄): ≤ 0.5%
Heavy metals (as Pb): ≤ 0.0025%
Fe (Iron): ≤ 0.03%
Loss on ignition (2 h, 900 °C): ≤ 8.5%
Particle size: (< 0.1 mm) about 99
Bulk density: about 6
Names of Hydrated Silica:
Regulatory process names:
Silicic acid
Silicic acid
Silicic acid
Silicic acid (polyortho)
IUPAC names:
dihydroxysilanone
silica gel
Silicic acid
Silicic acid
Silicic acid
Other identifiers:
1236274-32-0
12673-75-5
1343-98-2
158296-67-4
245762-04-3
42615-48-5
511311-35-6
68373-08-0
84141-05-9
9063-16-5
98530-20-2
