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7699-41-4

Basic Information
CAS No.: 7699-41-4
Name: Silicic acid
Article Data: 18
Molecular Structure:
Molecular Structure of 7699-41-4 (Silicic acid)
Formula: H2O3Si
Molecular Weight: 78.0996
Synonyms: 7699-41-4
EINECS: 231-716-3
Melting Point: 1704℃
Solubility: Insoluble in water or acid, soluble in potassium hydroxide and sodium hydroxide solution
Appearance: White amorphous powder or bulk
Hazard Symbols: IrritantXi
Risk Codes: 36/37
Safety: 22-26-36
PSA: 57.53000
LogP: -1.61360
Synthetic route

sodium silicate

7664-93-9

sulfuric acid

7699-41-4

silicic acid

Conditions
ConditionsYield
In water

sodium metasilicate nonahydrate

7697-37-2

nitric acid

7699-41-4

silicic acid

Conditions
ConditionsYield
In water at 40℃; for 1h; pH=5;
7647-01-0

hydrogenchloride

sodium silicate

7699-41-4

silicic acid

Conditions
ConditionsYield
In water at 20℃; for 24h;
6802-75-1

diethyl isopropylidenemalonate

37688-96-3

1,14-dibromotetradecane

7699-41-4

silicic acid

103199-02-6

tetraethyl 3,3,18,18-tetramethyleicosanetetraoate

Conditions
ConditionsYield
copper(l) chloride In tetrahydrofuran; petrol ether; benzene86%
539-74-2

Ethyl 3-bromopropionate

23042-76-4

2-amino-3,5-dimethoxyacetophenone

7699-41-4

silicic acid

98300-29-9

2'-(N-2-Carbethoxyethylamino)-3',5'-dimethoxyacetophenone

Conditions
ConditionsYield
With sodium acetate; acetic acid In dichloromethane; water; ethyl acetate66.3%
With sodium acetate; acetic acid In chloroform-d1; dichloromethane; water; ethyl acetate

alumina hydrate

7699-41-4

silicic acid

Modified catalyst support EXAMPLE S3

Modified catalyst support EXAMPLE S3

Conditions
ConditionsYield
Stage #1: alumina hydrate; silicic acid In water at 100℃; for 16h;
Stage #2: at 725℃; for 4h;
7699-41-4

silicic acid

189268-26-6

1-[3-({[tert-butyl(diphenyl)silyl]oxy}methyl)-2,4-dichlorophenyl]-1H-pyrrole-2-carbonitrile

1-(3-tert-butyldiphenylsilyloxymethyl-2,4-dichlorophenyl)-4-chloro-2-cyanopyrrole

Conditions
ConditionsYield
With tert-butylhypochlorite In tetrachloromethane
With tert-butylhypochlorite In tetrachloromethane

methyl cis-2-[(1-(4-Bromobenzyl)-5-methoxy-2-methyl-1H-indol-3-yl)methyl]cyclopropanecarboxylate

7699-41-4

silicic acid

trans-2-[(1-(4-Bromobenzyl)-5-methoxy-2-methyl-1H-indol-3-yl)methyl]cyclopropanecarboxylic acid

Conditions
ConditionsYield
With sodium hydroxide; citric acid In tetrahydrofuran; methanol; hexane; ethyl acetate
73862-81-4

5,12-epoxy-1,2,3,4,5,12-hexahydro-2-naphtacenyl methyl ketone

7699-41-4

silicic acid

76811-54-6

2-acetyl-1,2,3,4-tetrahydro-5,12-naphtacenequinone

Conditions
ConditionsYield
With trifluoroacetic acid In diethyl ether; dichloromethane; chloroform
55815-69-5

1-methoxy-6,6-dimethyl-6H-benzo[c]chromen-3-ol

55815-58-2

1-(3-hydroxy-1-methoxy-6,6-dimethyl-6H-benzo[c]chromen-4-yl)-ethanone

95-92-1

oxalic acid diethyl ester

7699-41-4

silicic acid

57394-20-4

ethanolamine salt of 2-carboxy-4-oxo-6,6-dimethyl-11-methoxy-4H,6H-[2]-benzopyrano-[3,4-f]-[1]-benzopyran

Conditions
ConditionsYield
With hydrogenchloride; sodium hydroxide; sodium; acetic acid In ethanol; water; benzene
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Consensus Reports

IARC Cancer Review: Group 3 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 ,1987,p. 341.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 42 ,1987,p. 39.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 42 ,1987,p. 39.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . Reported in EPA TSCA Inventory.

Standards and Recommendations

OSHA PEL: TWA 6 mg/m3
ACGIH TLV: TWA (nuisance particulate) 10 mg/m3 of total dust (when toxic impurities are not present, e.g., quartz <1%)
DFG MAK: 0.3 mg/m3 as fine dust

Analytical Methods

For occupational chemical analysis use or NIOSH: 1994: silica, amorphous, 7501.

Specification

The IUPAC name of Silicic acid(H2SiO3) is dihydroxy(oxo)silane. With the CAS registry number 7699-41-4 and EINECS 231-716-3, it is also named as Acidum silicicum. The product's categories are Inorganics; Acids; Electronic Chemicals; Micro / Nanoelectronics; Adsorption / Partition; Protein Chromatography; Silica. It is white amorphous powder or bulk which is insoluble in water or acid, soluble in potassium hydroxide and sodium hydroxide solution. Additionally, this chemical should be sealed in the container and stored in the cool and dry place.

The other characteristics of this product can be summarized as: (1)#H bond acceptors: 3; (2)#H bond donors: 2; (3)#Freely Rotating Bonds: 0; (4)Polar Surface Area: 35.53 Å2; (5)Exact Mass: 77.97732; (6)MonoIsotopic Mass: 77.97732; (7)Topological Polar Surface Area: 57.5; (8)Heavy Atom Count: 4; (9)Formal Charge: 0; (10)Complexity: 26.3; (11)Isotope Atom Count: 0; (12)Covalently-Bonded Unit Count: 1.

Preparation of Silicic acid(H2SiO3): Adding a certain amount of sodium silicate (SiO2 22.9% ~ 39%, Na2O 8.6% ~ 14.6%) to the reaction kettle. And then adding a small amount of sulfuric acid to fully dissolve while stirring. Adding a certain amount of aluminum sulfate (Si / Al molar ratio 2:5). Diluted with water to the content of SiO2 of 0.5% to 1.0%. Finally, after stirring, we can get the product by motionlessness and aging with 1.5h.

Uses of Silicic acid(H2SiO3): It is used as coagulant and analytical reagent. It is also used as basic raw materials of powder cosmetics and and toothpaste.

When you are using this chemical, please be cautious about it as the following:
It is irritating to eyes and respiratory system, so people should not breathe dust. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If you want to contact this product, you must wear suitable protective clothing.

People can use the following data to convert to the molecule structure.
1. SMILES:O=[Si](O)O
2. InChI:InChI=1/H2O3Si/c1-4(2)3/h1-2H
3. InChIKey:IJKVHSBPTUYDLN-UHFFFAOYAA

The following are the toxicity data which has been tested.

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LDLo intravenous 234mg/kg (234mg/kg)   AMA Archives of Industrial Health. Vol. 17, Pg. 204, 1958.