Fluorosilicic acid
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Fluorosilicic acid
structure -
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CAS No:
16961-83-4
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Formula:
F6Si.2H
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Chemical Name:
Fluorosilicic acid
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Synonyms:
Silicate(2-),hexafluoro-,hydrogen (1:2);Silicate(2-),hexafluoro-,dihydrogen;Fluosilicic acid;Dihydrogen hexafluorosilicate;Hexafluorosilicic acid;Hydrofluorosilicic acid;Fluorosilicic acid;Fluorosilicic acid (H2SiF6);Silicon hexafluoride dihydride;Dihydrogen hexafluorosilicate(2-);Hydrogen hexafluorosilicate (H2SiF6);NSC 16894;Hydrosilicofluoric acid;1309-45-1;12672-67-2;1202864-64-9
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CAS No:
Description
Fluosilicic acid,H2SiF6, also known as hydrofluorosilicic acid,is a colorless liquid that is soluble in water. It is highly corrosive and toxic,attacking glass and stoneware. Fluosilicic acid is used in water fluoridation, electroplating, and in manufacturing enamels and cement. Fluorosilicic acid is a transparent, colorless fuming liquid.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 ca
Characteristics
0
2.36540
Clear colorless Liquid
1.22 g/mL at 25 °C
No melting point
120 °C (approx)
108-109°C
1.35
H2O: 1 mg/mL, clear, colorless
−20°C
see Notes
Hypodermic-Frog LDL0: 140 mg/kg
Decomposition by heat produces toxic hydrogen fluoride gas
Safety Information
II
8
UN 1778 8/PG 2
3
34-35-20/21/22
26-36/37/39-45-27
VV8225000
C
The warehouse is ventilated, low temperature and dry; stored separately from food additives and alkalis
Corrosive
Stable in aqueous solution.
P280-P301 + P312 + P330-P303 + P361 + P353-P304 + P340 + P310-P305 + P351 + P338
H302-H311-H314
Fluorosilicic acid Use and Manufacturing
Silica powder acid hydrolysis method Hydrofluoric acid is first added to the lead-line acid hydrolysis equipment, and then the silica powder is gradually added to make it react. After the reaction is complete, add rice bran ash to neutralize the free hydrofluoric acid, and at the same time act as a bleaching solution, filter the solution, and add an appropriate amount of Huangdan powder (PbO) to the filtrate to remove the hydrofluoric acid. The sulphate which is added is then filtered to obtain the finished fluorosilicic acid product. Its 6HF+SiO2→H2SiF6+2H2O
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.
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