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Hexafluorosilicic acid is an inorganic compound with the chemical formula H.
Aqueous solutions of hexafluorosilicic acid consist of salts of the cation and the hexafluorosilicate anion.
These salts and their aqueous solutions are colorless.
Hexafluorosilicic acid is produced naturally on a large scale in volcanoes.
It is produced as a by-product in the production of phosphate fertilizer.
The resulting hexafluorosilicic acid is consumed almost entirely as a precursor to aluminum trifluoride and synthetic cryolite, which are used in aluminum processing.
Salts derived from hexafluorosilicic acid are called hexafluorosilicates
CAS number: 16961-83-4
Molecular weight:144.09
Molecular formula: H2SiF6
EC number: 241-034-8
Hexafluorosilicic acid has been crystallized as various hydrates.
These include (H5O2) 2SiF6, the more complex (H5O2) 2SiF6 2H2O, and (H5O2) (H7O3) SiF 6 4.5H2O.
In all of these salts, the octahedral hexafluorosilicate anion is hydrogen bonded to the cations.
Aqueous solutions of hexafluorosilicic acid are generally designated as H.
Hexafluorosilicic acid is produced commercially from fluoride-containing minerals, including silicates.
It is treated with sulfuric acid to give phosphoric acid, the precursor to many water-soluble fertilizers.
This is called the wet phosphoric acid process.
As a byproduct, approximately 50 kg of hexafluorosilicic acid per ton of HF is produced due to reactions involving silica-containing mineral impurities.
Some of the hydrogen fluoride (HF) produced during this process are inevitable components of the mineral feedstock.
Silicon dioxide (SiO2) reacts with impurities to give silicon tetrafluoride.
The silicon tetrafluoride thus formed further reacts with HF.
The net process can be described as follows:
6 HF + SiO2 → SiF2
Hexafluorosilicic acid can also be produced by treating silicon tetrafluoride with hydrofluoric acid.
The majority of hexafluorosilicic acid is converted to aluminum fluoride and synthetic cryolite.
These materials are central to the conversion of aluminum ore into aluminum metal.
The conversion to aluminum trifluoride is described as follows:
H 2 SiF 6 + Al 2 Ö 3 → 2 AlF 3 + SiO 2 + H 2 O
Hexafluorosilicate acid is also converted into a variety of useful hexafluorosilicate salts.
Hexafluorosilicic acid is used in porcelain production, magnesium salt is used for hardened concrete and as an insecticide, and barium salts are used for phosphorus.
Hexafluorosilicic acid and its salts are used as wood preservatives.
Hexafluorosilicic acids used as fluorinating agents may contain some impurities.
Concerns have been raised about various heavy metals present as low-concentration impurities in commercial hexafluorosilicic acid.
Average concentrations of arsenic, mercury, lead and cadmium in hexafluorosilicic acid are low.
Hexafluorosilicic acid conversion rate 10 to 400 mg/kg.
Therefore, fluoridation of drinking water contributes only to a limited extent to the total exposure to these contaminants.
These calculated concentrations are at least two orders of magnitude below drinking water guideline values for these metals set by WHO and other organizations.
Therefore Hexafluorosilicic acid is not considered an additional health risk
Hydrofluorosilicic acid is a colorless to light brown liquid.
It is also produced from calcium fluoride or other fluoride-containing products.
Hydrofluorosilicic acid is a strong suppressant of many silicates during the flotation of a number of oxidic minerals.
It is used in gangue depression during the flotation of tin, columbite and tantalite.
Hydrofluorosilicic acid is produced and imported in the European Economic Area at a rate of ≥ 10,000 to < 100,000 tonnes per year.
Hydrofluorosilicic acid is used by consumers in formulation or repackaging, in industrial facilities, and in manufacturing.
Hydrofluorosilicic acid can react with strong acids (such as sulfuric acid) to release toxic hydrogen fluoride fumes.
Hydrofluorosilicic acid damages glass and materials containing silica.
Hydrofluorosilicic acid reacts exothermically with chemical bases.
It reacts with active metals, including iron and aluminum, and dissolves the metal.
Hydrofluorosilicic acid releases hydrogen and toxic gases.
Hydrofluorosilicic acid can initiate polymerization in alkenes.
It reacts with cyanide salts and compounds to release gaseous hydrogen cyanide.
Hydrofluorosilicic acid flammable and toxic gases are frequently also produced by reactions with nitrides, nitriles, sulphides, and weak or strong reducing agents.
Additional gas-producing reactions may occur with sulfides, nitrites, thiosulfates (to yield H2S and SO3), dithionites (SO2), and carbonates.
Hydrofluorosilicic acid can catalyze chemical reactions.
When hydrofluorosilicic acid is heated to its boiling point, it decomposes to produce hydrogen fluoride gas, which is very toxic and corrosive.
Hydrofluorosilicic acid; Aluminum fluoride is used in the preparation of cryolite and sodium fluorosilicate.
Hydrofluorosilicic acid is used as an analytical reagent.
Hydrofluorosilicic acid is also used in the synthesis of silicates.
Hydrofluorosilic acid is the basic raw material for the preparation of potassium, ammonium, magnesium, copper, barium, lead and other fluorosilicates and silicon tetrafluoride.
Hydrofluorosilicic acid is used for beer production industrial equipment disinfection and lead electrolytic refining.
Hydrofluorosilicic acid is used as a mordant and metal surface treatment agent.
Hexafluorosilicic acid is commonly used as a source of fluoride.
Hydrofluorosilicate acid is converted into a variety of useful hexafluorosilicate salts.
Hydrofluorosilicic acid is also used as an electrolyte for the refining of lead.
Hydrofluorosilicic acid is an important organic reagent for cleaving the Si-O bonds of silyl ethers.
Hydrofluorosilicic acid is also used in the preservation of wood and the surface modification of calcium carbonate.
Hydrofluorosilicic acid is miscible with water.
HYDROPLUROSYLIC ACID CHEMICAL AND PHYSICAL PROPERTIES
Physical state: Liquid
Appearance: Clear, colorless to pale straw liquid.
Color: Colorless
Odour: characteristic
Odor threshold: No data
PH: 1
Melting point: Not applicable
Freezing point: No data available
Boiling point: 105°C
Flash point: No data available
Relative evaporation rate (butylacetate=1): No data
Flammability (solid, gas): Not flammable.
Vapor pressure: No data
Relative vapor density at 20 °C: No data
Relative density: No data available
Solubility: Soluble.
Partition coefficient n-octanol/water (Log Pow): No data
Hydrofluorosilicic acid is corrosive to the skin.
Inhalation exposure to high levels of hydrofluorosilicic acid may cause pulmonary edema.
Hydrofluorosilicic acid is marketed strictly as an aqueous solution.
The hydrofluorosilicic acid anhydrous form decomposes almost instantly to silicon tetrafluoride and hydrofluoric acid.
60-70% solutions solidify at approximately 19°C to form a crystalline dihydrate.
Fumes in the air; When mixed with water it produces heat and corrosive fumes.
This smoke causes burns to eyes and skin.
Hydrofluorosilicic acid causes burns.
Hydrofluorosilicic acid is toxic if swallowed.
Hydrofluorosilicic acid is a water-insoluble silicon source for use in oxygen-sensitive applications such as metal fabrication.
Hydrofluorosilicic acid uses extremely low concentrations (ppm) of fluoride compounds in healthcare applications.
Hydrofluorosilicic acid compounds also have important uses in synthetic organic chemistry.
Hydrofluorosilicic acid is also widely used for alloying metal and optical deposition.
Some Hydrofluorosilicic acid fluoride compounds can be produced at nanoscale and ultra-high purity.
Hydrofluorosilicic acid is generally readily available in most volumes.
Hydrofluorosilicic acid ultra-high purity and high-purity compositions improve both optical quality and usefulness as scientific standards.
Elemental powders and suspensions can be considered as high surface area forms of hydrofluorosilicic acid.
Hydrofluorosilicic acid is produced naturally on a large scale in volcanoes.
Hydrofluorosilicic acid is produced as a by-product in the production of phosphate fertilizers.
Hydrofluorosilicic acid is consumed almost exclusively as a precursor to aluminum trifluoride and synthetic cryolite, which are used in aluminum processing.
Salts derived from hydrofluorosilicic acid are called hexafluorosilicates.
Hydrofluorosilicic acid is a type of inorganic acid.
For chemical synthesis, it is largely used in the production of aluminum fluoride and cryolite, as well as many types of hexafluorosilicate salts.
It can also be used in the production of Hydrofluorosilicic acid silicon and silicon dioxide.
SOME FEATURES
Fluosilicic acid, also known as hydrofluorosilicic acid (H2SiF6), is a colorless liquid that is soluble in water.
Hydrofluorosilicic acid is highly corrosive and toxic.
Hydrofluorosilicic acid damages glass and stoneware.
Hydrofluorosilicic acid is used in the fluorination of water, electroplating, and the production of enamels and cement.
Hydrofluorosilicic acid is a transparent, colorless, fuming liquid.
d 1.220 g cm for 25% aqueous solution.
Hydrofluorosilicic acid has a piercing pungent odor.
Hydrofluorosilicic acid is a colorless, hazy liquid.
Hydrofluorosilicic acid is corrosive to metals and tissues.
Very brief contact with both smoke and liquid can cause severe and painful burns.
Hydrofluorosilicic acid is used in water fluorination, hardening of cement and ceramics, and as a wood preservative.
SOME AREAS OF USE
Hydrofluorosilicic acid, which provides effective cleavage of silicon-oxygen bonds, is a source of fluoride with both protic and Lewis acid properties.
Hydrofluorosilicic acid is commonly used as a source of fluoride.
A 1-2% solution of hydrofluorosilicic acid is commonly used for sterilization of equipment in brewing and bottling businesses.
Hydrofluorosilicic acid is used in the electrolytic refining of lead.
Hydrofluorosilicic acid is used in electroplating and hardening of cement.
Hydrofluorosilicic acid is used in crumbling lime or brick, removing lime from leather during the tanning process, and removing molds.
Hydrofluorosilicic acid is used in other concentrations as a timber preservative.
Hydrofluorosilicic acid is extremely corrosive in contact with skin and if inhaled.
Inhalation of hydrofluorosilicic acid vapor has a serious corrosive effect on mucous membranes.
Swallowing causes severe burns to the mouth and stomach.
Contact with liquid or vapor causes severe burns to eyes and skin.
Hydrofluorosilicic acid is a colorless gas.
Hydrofluorosilicic acid is not stable and will decompose.
Hydrofluorosilicic acid readily decomposes into silicon and fluoride.
Hydrofluorosilicic acid aqueous solution is colorless and strongly acidic.
Hydrofluorosilicic acid is corrosive.
When the concentrated solution of hydrofluorosilicic acid is cooled, colorless dihydrate crystals precipitate and the melting point becomes 19°C.
Hydrofluorosilicic acid has disinfecting properties.
Hydrofluorosilicic acid contains calcium phosphate mixed with apatite, a mineral with high phosphate and fluoride content.
The hydrofluorosilicic acid is refluxed with sulfuric acid.
Fluoride gas is captured and used to create fluorosilicic acid.
Sodium fluorosilicate and sodium fluoride come from the processing of Hydrofluorosilicic acid.
Hydrofluorosilicic acid can be partially neutralized with table salt or caustic soda to obtain sodium fluorosilicate.
If enough caustic soda is added to completely neutralize the hydrofluorosilicic acid, the result is sodium fluoride.
Approximately 90% of the sodium fluoride used in the United States comes from Hydrofluorosilicic acid.
Hydrofluorosilicic acid is a coupling agent.
It is largely used for water fluoridation in the United States to minimize the incidence of tooth decay and dental flora.
Hydrofluorosilicic acid is used especially in the glass processing industry.
Since hydrofluorosilicic acid is corrosive to glass, they cannot be stored in glass bottles.
Hydrofluorosilicic acid is a clear liquid and is defined as HF.
Extreme care should be taken when using hydrofluorosilicic acid.
While inhalation of hydrofluorosilicic acid can cause serious poisoning, contact with the skin can cause deep burns.
Anhydrous hydrogen fluoride and hydrofluoric acid should only be worked in a fume hood, and gloves, as well as protective glasses or a face mask, should be worn.
Hydrofluoric acid is also used to make high-octane gasoline.
Additionally, hydrofluorosilicic acid usage areas include; There is purification of aluminum and uranium.
There are also issues such as rust removal in hydrofluorosilicic acid laundry products and catalyst in the oil industry.
Hydrofluorosilicic acid, due to its ability to dissolve silicate compounds, is frequently used during the mineral and rock analysis process to dissolve rock samples.
Tooth enamel consists largely of hydroxyapatite.
Enamel is a substance that can be easily damaged by acids.
Naturally occurring bacteria in the mouth, especially Streptococcus mutans, feed on sugar.
It metabolizes sugar and turns it into acid, and bruises appear.
However, Hydrofluorosilicic acid penetrates into the structure of the tooth if fluoride is taken through nutrition or applied locally to the tooth.
Hydrofluorosilicic acid forms a more acid-resistant substance called fluorapatite.
It was previously believed that the best way to add fluoride to teeth was through food.
Adding fluoride to water actually reduces the incidence of cavities.
However, to what extent it does this is a matter of debate.
In recent years, the introduction of fluoride toothpastes, mouthwashes and nutritional supplements reduces the effects of fluoridated water.
Underprivileged communities are most likely to see the benefits of fluoridated water supplies.
SYNONYMS
Hexafluorosilicic acid
Fluorosilicic acid
16961-83-4
Dihydrogen hexafluorosilicate
Silicate(2-), hexafluoro-, dihydrogen
Silicon hexafluoride dihydride
Fluorosilicic acid (H2SiF6)
hexafluorosilicon(2-); Hydron
MFCD00036289
FLUOROSILIC ACID
Kieselfluorwasserstoffsaure
FLUOSILICIC ACID [MI]
53V4OQG6U1
DTXSID2029741
Dihydrogen hexafluorosilicate(2-)
OHORFAFFMDIQRR-UHFFFAOYSA-P
NSC-16894
hexakis(fluoranyl)silicon(2-); Hydron
FT-0626488
HYDROGEN HEXAFLUOROSILICATE (H2SIF6)
HEXAFLUOROSILICATE(2-)HYDROGEN (1:2)
FLUOSILICIC ACID (HYDROFLUOSILICIC ACID)
HYDROFLUORIC ACID
Hydrogen fluoride
7664-39-3
Fluorhydric acid
fluorane
hydrofluoride
rubigine
Fluorwasserstoff
Fluohydric Acid
Antisal 2B
Hydrofluoricum acidum
Fluorowodor
Fluorwaterstof
Hydrogenfluoride
fluoric acid
Caswell No. 484
Acido fluoridrico
Hydrogen-fluoride
Hydrogen fluoride (HF)
Acido fluorhydrico
acid fluorhydrique
UN 1052 (anhydrous)
RCRA waste number U134
HSDB 546
fluoridohydrogen
CHEBI:29228
UNII-RGL5YE86CZ
RGL5YE86CZ
EINECS 231-634-8
Fluorure d'hydrogene anhydre
Hydrogen fluoride, anhydrous
Fluoruro de hydrogeno anhydro
fluorure d'hydrogene
EPA Pesticide Chemical Code 045601
NSC-750679
DTXSID1049641
EC 231-634-8
NSC 750679
32057-09-3
FLUORINE, ISOTOPE OFMASS 18, AT.
(HF)
[HF]
Fluorowodor [Polish]
Fluorwaterstof [Dutch]
HYDROFLUORIC ACID (MART.)
HYDROFLUORIC ACID [MART.]
hydrogenfluoride
Fluorwasserstoff [German]
MFCD00011346
Fluorohydric acid
Hydrofluoric acid, ACS reagent, 48%
Acid, Fluohydric
Acid, Fluorhydric
Acido fluoridrico [Italian]
Acid, Hydrofluoric
Fluoride, Hydrogen
Acide fluorhydrique [French]
Acido fluorhydrico [Spanish]
hydrofluoric acid gas
HF-A
UN1052
UN1790
Anhydrous hydrogen fluoride
RCRA waste no. U134
Fluorure d'hydrogene anhydre [French]
fluoroorganics
fluorum
Fluoruro de hydrogeno anhydro [Spanish]
Hydrogen fluoride (anhydrous)
etching acid
hydrofluoric acid
Deuteriumfluoride
hydrogen flouride
fluoroorganic compound
organofluorine compound
Aqueous hydrogen fluoride
Hydrofluoric acid 70% by weight or more HF
flororganische Verbindungen
Hydrofluoric acid, anhydrous
Hydrofluoric acid, 55%, CP
HYDROFLUORIC ACID [MI]
HYDROGEN FLUORIDE [MI]
CHEMBL1232767
DTXCID8029600
HYDROFLUORIC ACID [HSDB]
CHEBI:37143
HYDROFLUORIC ACID [VANDF]
Hydrogen fluoride/Hydrofluoric acid (conc 50% or greater)
ANHYDROUS HYDROFLUORIC ACID
Hydrofluoric acid, AR, >=40%
KRHYYFGTRYWZRS-UHFFFAOYSA-N
HYDROFLUORIC ACID [WHO-DD]
Hydrofluoric acid, LR, 39-43%
Hydrofluoric acid, SAJ first grade
HYDROFLUORICUM ACIDUM [HPUS]
BDBM50499187
Hydrofluoric acid, 48% ACS reagent
Hydrofluoric acid, JIS special grade
NSC750679
AKOS024438092
USEPA/OPP Pesticide Code: 45601
DB11072
Hydrofluoric acid, technical, 40-45%
37249-79-9
Hydrofluoric acid, technical grade, 68.0%
FT-0627129
Q2468
