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| CAS No.: | 7699-41-4 |
|---|---|
| Name: | Silicic acid |
| Molecular Structure: | |
|
|
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| 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: |
 Xi
|
| Risk Codes: | 36/37 |
| Safety: | 22-26-36 |
| PSA: | 57.53000 |
| LogP: | -1.61360 |
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| Conditions | Yield |
|---|---|
| In water |
| Conditions | Yield |
|---|---|
| In water at 40℃; for 1h; pH=5; |
| Conditions | Yield |
|---|---|
| In water at 20℃; for 24h; |
- 6802-75-1
diethyl isopropylidenemalonate
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1,14-dibromotetradecane
- 7699-41-4
silicic acid
- 103199-02-6
tetraethyl 3,3,18,18-tetramethyleicosanetetraoate
| Conditions | Yield |
|---|---|
| copper(l) chloride In tetrahydrofuran; petrol ether; benzene | 86% |
- 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 | Yield |
|---|---|
| With sodium acetate; acetic acid In dichloromethane; water; ethyl acetate | 66.3% |
| With sodium acetate; acetic acid In chloroform-d1; dichloromethane; water; ethyl acetate |
- 7699-41-4
silicic acid
| Conditions | Yield |
|---|---|
| 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
| Conditions | Yield |
|---|---|
| With tert-butylhypochlorite In tetrachloromethane | |
| With tert-butylhypochlorite In tetrachloromethane |
- 7699-41-4
silicic acid
| Conditions | Yield |
|---|---|
| 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 | Yield |
|---|---|
| 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 | Yield |
|---|---|
| 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. |