Hexafluorosilicic acid

Base Information

• Chemical Name: Hexafluorosilicic acid
• CAS No.: 16961-83-4
• Molecular Formula: F₆Si*2H
• Molecular Weight: 144.092
• Hs Code.: 28111990
• Mol file: 16961-83-4.mol

Synonyms:Fluosilicicacid (6CI);Dihydrogenhexafluorosilicate;Dihydrogen hexafluorosilicate(2-);Fluorosilicic acid;Silicate(2-),hexafluoro-, hydrogen (1:2);Hydrogen hexafluorosilicate (H2SiF6);NSC 16894;Silicon hexafluoride dihydride;

Chemical Property of Hexafluorosilicic acid

Chemical Property:

• Appearance/Colour: colourless liquid
• Vapor Pressure: 23hPa at 19.85℃
• Refractive Index: 1.3500
• Boiling Point: 108-109 °C
• PKA: 1.83[at 20 ℃]
• Flash Point: 108-109°C
• PSA: 0.00000
• Density: 1.22 g/mL at 25 °C
• LogP: 2.36540
• Storage Temp.: −20°C
• Solubility.: H2O: 1 mg/mL, clear, colorless
• Water Solubility.: Miscible with water.

Purity/Quality:

99% ^*data from raw suppliers

Adrenocorticotropic Hormone, Human ^*data from reagent suppliers

Safty Information:

• Pictogram(s): C
• Hazard Codes: C
• Statements: 34-35-20/21/22
• Safety Statements: 26-36/37/39-45-27

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Description: Hexafluorosilicic acid is a kind of inorganic acid. It is majorly used for the fluoridation of water in United State to minimize the incidence of dental caries and dental fluorosis. For chemical synthesis, it is majorly used for the manufacturing of aluminum fluoride and cryolite as well as many kinds of hexafluorosilicate salts. It can also be used for the production of silicon and silicon dioxide. It can also be used as an electrolyte in the Betts electrolytic process for refining lead. It is also a specialized reagent in organic synthesis for cleaving Si–O bonds of silyl ethers.
• Physical properties: d 1.220 g cm?3 for a 25% aq solution.
• Uses: A fluoride source with both protic and Lewis acid properties providing efficient cleavage of silicon–oxygen bonds, e.g. silyl ether deprotection. Hexafluorosilicic acid is commonly used as a source of fluoride. It is converted to a variety of useful hexafluorosilicate salts. It is also used as an electrolyte in the Betts electrolytic process for refining lead. It is an important organic reagent for cleaving Si-O bonds of silyl ethers. Further, it is used as wood a preservation agent and also used in surface modification of calcium carbonate. A 1-2% solution is used widely for sterilizing equipment in brewing and bottling establishments. Other concentrations are used in the electrolytic refining of lead, in electroplating, for hardening cement, crumbling lime or brick work, for the removal of lime from hides during the tanning process, to remove molds, as preservative for timber.

Technology Process of Hexafluorosilicic acid

There total 60 articles about Hexafluorosilicic acid which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield:

trifluorosilane (13465-71-9) → silicic acid + fluorosilicic acid (16961-83-4) + silica gel (112926-00-8,7631-86-9) + silicon tetrafluoride (7783-61-1)

Guidance literature:

With oxygen; In neat (no solvent); reaction with detonation of a mixture of SiHF3 and O2 in a tube in contact with a flame;;

Reference yield:

silicon monoxide + hydrogen fluoride (7664-39-3,12381-92-9,32057-09-3,74835-82-8) + silver perchlorate → perchloric acid (7601-90-3) + fluorosilicic acid (16961-83-4) + silver (7440-22-4)

Guidance literature:

In hydrogen fluoride; byproducts: H2O; aq. HF;

Reference yield:

silicon tetrafluoride (7783-61-1) → fluorosilicic acid (16961-83-4) + hydrogen fluoride (7664-39-3,12381-92-9,32057-09-3,74835-82-8)

Guidance literature:

With water; In water; slow decompn. of SiF4 by atmospheric moisture;;

upstream raw materials:

hydrogen fluoride

boric acid

silicon

silver fluoride

Downstream raw materials:

chromium (II)

magnesium fluoride

hexaquo nickel(II) hexafluorosilicate

Al₂F₆*7H₂O

Refernces

• 1、 Glaser, Jochen,Bettentrup, Helga,Justei, Thomas,Juergen Meyer, Land H.-. "Synthesis and properties of tetracyanamidosilicates ARE[Si(CN 2)4]". . p. 2954 - 2959. Retrieved 2010.
• 2、 Liang,Readey. "DISSOLUTION KINETICS OF CRYSTALLINE AND AMORPHOUS SILICA IN HYDROFLUORIC-HYDROCHLORIC ACID MIXTURES.". . p. 570 - 577. Retrieved 1987.
• 3、 Johnson, G. K.,Tasker, I. R.,Howell, D. A.,Smith, J. V.. "Thermodynamic properties of silicalite SiO2". . p. 617 - 632. Retrieved 1987.
• 4、 Kleboth, K.. "". . . Retrieved 1968.
• 5、 Chen, Zhan,Singh, Rajiv K.. "Effect of additives on copper outplating onto silicon surface from dilute HF solutions". . p. G360-G367. Retrieved 2008/10/09.