Search results
Results from the WOW.Com Content Network
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 solid noble gas matrix. It can exist as a high temperature gas, or an isolated molecule in a solid noble gas matrix.
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 ...
Boron trifluoride was discovered in 1808 by Joseph Louis Gay-Lussac and Louis Jacques Thénard, who were trying to isolate "fluoric acid" (i.e., hydrofluoric acid) by combining calcium fluoride with vitrified boric acid. The resulting vapours failed to etch glass, so they named it fluoboric gas. [27] [28]
Sodium fluoride: yellow is fluorine, purple is sodium. They are isoelectronic, but fluorine is bigger because its nuclear charge is lower. The alkali metals form monofluorides. All are soluble and have the sodium chloride (rock salt) structure, [47] Because the fluoride anion is basic, many alkali metal fluorides form bifluorides with the ...
4 serves as a fluorine source to deliver an equivalent of fluoride. [2] The Balz–Schiemann reaction for the synthesis of aryl fluorides is the best known example of such a reaction. [3] Ether and halopyridine adducts of HBF 4 have been reported to be effective reagents for the hydrofluorination of alkynes. [4]
The tables below present an example of an artificial seawater (35.00‰ of salinity) preparation devised by Kester, Duedall, Connors and Pytkowicz (1967). [1] The recipe consists of two lists of mineral salts, the first of anhydrous salts that can be weighed out, the second of hydrous salts that should be added to the artificial seawater as a solution.
Neodymium(III) fluoride is often used in the manufacture of fluoride glasses. [3] When neodymium is extracted from ores, the fluoride is often an intermediate product and is then reduced to the solid metal chemically (e.g. by adding calcium, which produces calcium fluoride) or by fused-salt electrolysis.