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Calcium fluoride is the inorganic compound of the elements calcium and fluorine with the formula CaF 2. It is a white solid that is practically insoluble in water. It occurs as the mineral fluorite (also called fluorspar), which is often deeply coloured owing to impurities.
Calcium(I) fluoride is an unstable inorganic chemical compound with the chemical formula CaF. It can exist as a high temperature gas, or an isolated molecule in a ...
Fluorite and various combinations of fluoride compounds can be made into synthetic crystals which have applications in lasers and special optics for UV and infrared. [39] Exposure tools for the semiconductor industry make use of fluorite optical elements for ultraviolet light at wavelengths of about 157 nanometers. Fluorite has a uniquely high ...
Fluoride has a high tendency to react with the calcium hydroxyapatite Ca10(PO4)6(OH)2 in tooth enamel due to its high affinity to metals. [8] [10] It subsequently replaces the hydroxide group in hydroxyapatite to precipitate calcium fluorapatite Ca5(PO4)3)F. [8] These fluorapatite precipitations scavenge excess phosphate and calcium in the saliva to form a supersaturated solution for ...
During this window of time, reversing a cavity may be possible using fluoride or hydroxyapatite, according to White. “Once the cavity has passed the first layer of the tooth into the dentin, a ...
The application of hexafluorosilicic acid to a calcium-rich surface such as concrete will give that surface some resistance to acid attack. [13] CaCO 3 + H 2 O → Ca 2+ + 2 OH − + CO 2 H 2 SiF 6 → 2 H + + SiF 2− 6 SiF 2− 6 + 2 H 2 O → 6 F − + SiO 2 + 4 H + Ca 2+ + 2 F − → CaF 2. Calcium fluoride (CaF 2) is an insoluble solid ...
The fluoride ion is readily absorbed by the stomach and intestines. Ingested fluoride forms hydrofluoric acid in the stomach. In this form, fluoride crosses cell membranes and then binds with calcium and interferes with various enzymes. Fluoride is excreted through urine. Fluoride exposure limits are based on urine testing, which is used to ...
Fluorapatite can be synthesized in a three step process. First, calcium phosphate is generated by combining calcium and phosphate salts at neutral pH. This material then reacts further with fluoride sources (often sodium monofluorophosphate or calcium fluoride (CaF 2)) to give the mineral.