けい酸

Orthosilicic acid

HCID 14942CAS 10193-36-9

部分構造検索類似構造を探す

基本情報

標準SMILES: O[Si](O)(O)O
InChIKey: RMAQACBXLXPBSY-UHFFFAOYSA-N
分子式: H4O4Si
平均分子量: 96.11 g/mol
単同位体質量: 95.98788514

概要

Silicic acid is a silicon oxoacid. It is a conjugate acid of a trihydrogensilicate(1-).

名称と識別子

優先名称: Orthosilicic acid
IUPAC: silicic acid
現地名: けい酸
英語名: tetrahydroxysilane
分子式: H4O4Si
分子量: 96.11

名称と別名

SILICIC ACIDOrthosilicic acidMonosilicic acidSilicon tetrahydroxideSilicasolTetrahydroxysiliconSilicic acid (Si(OH)4)Silicic acid (ortho)silanetetrolKieselsaeureOrthokieselsaeureEINECS 233-477-0

名称をさらに表示

テトラヒドロキシシランシランテトラオールけい素テトラヒドロキシドテトラヒドロキシけい素オルトけい酸けい酸silicicacisiliclc acidMONOSILICICACIDtetrahydroxysilane

UNII-623B93YABHtetrahydroxidosilicon623B93YABHH4SiO4Silicon hydroxide (Si(OH)4)CHEBI:26675ORTHOSILICIC ACID (H4SIO4)(Si(OH)4)

データベース識別子

CAS: 10193-36-9、1343-98-2
PubChem CID: 14942
DTXSID: DTXSID5058721
ChEBI: CHEBI:26675
UNII: 623B93YABH
EC Number: 215-683-2、233-477-0
Nikkaji: J148.210F

物性

構造計算による物性

極性表面積: 80.9 Å²
水素結合供与体数: 4
水素結合受容体数: 4
回転可能結合数: 0
重原子数: 5
形式電荷: 0
複雑度: 19.1

実験および物理化学的性質

Chemical ClassesMineral Dusts -> Other Mineral Dusts

CosmeticsViscosity controlling; Anticaking; Bulking; Opacifying; Abrasive; Absorbent

Density2.2 @25 °C

Melting Point1610 °C

Vapor Pressure10 [mm Hg] @1732 °C

Food Contact SubstancesFCS -> FDA Inventory of Food Contact Substances Listed in 21 CFR

物理化学的性質

沸点: 153 · 153-156 °C(Press: 2 Torr)
比重(密度): 2.63 g/cm3 · 2.63 g/cm3
蒸気圧: 1.333 hPa · 1.333hPa at 25℃
酸解離定数(Pka): 12.39 · 12.39±0.53(Predicted)
外見: 溶液中にのみ存在する
色: exists only in solution
水溶解度: 100 ng/L · 100ng/L at 25℃
Henry's Law Constant: 2.3 · 2.3×1010 mol/(m3Pa) at 25℃, Plyasunov (2012)
LogP: -1 at · -1 at 25℃
EPAの化学物質情報: Silicic acid (H4SiO4) (10193-36-9)

安全と法規制

GHS分類

GHS Classification · 6 件

This chemical does not meet GHS hazard criteria for 100% (168 of 168) of all reports.

Not Classified

Aggregated GHS information provided per 168 reports by companies from 1 notifications to the ECHA C&L Inventory.

This chemical does not meet GHS hazard criteria for 0.7% (1 of 135) of reports.

Danger

H314 (99.3%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]

危険有害性情報

Regulatory Information · 6 件

Chemical: Silicic acid (H4SiO4)

Chemical: Silicic acid

Silicic acid is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Silicic acid are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Status: Active Update: 08-07-2021 https://echa.europa.eu/registration-dossier/-/registered-dossier/32043

Silicic acid (H4SiO4): Does not have an individual approval but may be used as a component in a product covered by a group standard. It is not approved for use as a chemical in its own right.

Silicic acid: Does not have an individual approval but may be used under an appropriate group standard

Hazards SummaryCauses lung changes including focal fibrosis in intermittent inhalation studies of rats; [RTECS] A skin and strong eye irritant; Targets the lungs; [Sigma-Aldrich MSDS]

Hazard Classes and Categories · 2 件

Skin Corr. 1 (99.3%)

Not Classified

安全と保護具

Protective Action Criteria (PAC) · 3 件

18 [mg/m3]

200 [mg/m3]

1200 [mg/m3]

毒性情報

Adverse EffectsFibrogenic - Inducing tissue injury and fibrosis (scarring).

安全データ

tsca: TSCA listed

化学と産業

用途と製造

Uses · 1 件

Opal is the natural form; Used as a sorbent for column chromatography; Approximate molecular formula of H2-Si-O3; [Merck Index] A hydrated form of silicon dioxide. It is commonly used in the manufacture of TOOTHPASTES and as a stationary phase for CHROMATOGRAPHY. [ChemIDplus] Gel forms are used to absorb vapors and as insecticide carriers; [REPROTOX] Permitted for use as an inert ingredient in non-food pesticide products; [EPA]

U.S. Production2023: 50,000 - <250,000 lb

Industry UsesSolvent

Household ProductsInformation on 9 consumer products that contain Silicic acid in the following categories is provided:

Use ClassificationCosmetics -> Viscosity controlling; Anticaking; Bulking; Opacifying; Abrasive; Absorbent

General Manufacturing Information · 3 件

Paint and Coating Manufacturing

Silicic acid: ACTIVE

Silicic acid (H4SiO4): ACTIVE

応用分野

解説ケイ酸狭義では，オルトケイ酸H4SiO4をさすが，一般には組成がnSiO2･mH2Oで示される物質をさす．代表的なものは，オルトケイ酸H4SiO4と，メタケイ酸 (H2Si2O3)n である．二ケイ酸H2Si2O5のようなオリゴマーも確認されている．そのほか，分子がきわめて大きいシリカゲルやオパールがある．また，水ガラスなどの水溶液に酸を加えて生じる組成不定のゲル状の物質も一種の高分子のケイ酸である．森北出版「化学辞典（第2版）