Physicochemical properties of Calcium Fluoride CaF2
Calcium Fluoride CaF2 is an inorganic compound with the chemical formula CaF2, which is a colorless crystal or white powder. It is insoluble in water, slightly soluble in inorganic acid, and reacts with hot concentrated sulfuric acid to generate hydrofluoric acid. In the experiment, Calcium Fluoride CaF2 is generally prepared by reacting calcium carbonate with hydrofluoric acid or by repeatedly treating fluorite powder with concentrated hydrochloric acid or hydrofluoric acid. The natural Calcium Fluoride CaF2 mineral is fluorite or fluorite, which is often gray, yellow, green, purple and other colors, and sometimes colorless, transparent, vitreous, brittle, and has obvious fluorescence phenomenon.
Crystal structure: is an equiaxed crystal system, in the form of cube, octahedron or dodecahedron. Colorless crystal or white powder, natural ore contains impurities, slightly green or purple. Glows when heated. The density is 3.18g/cm3, the melting point is 1402℃, the boiling point is 2500℃, and the refractive index is 1.434. Low toxicity. Extremely insoluble in water. Soluble in hydrochloric acid, hydrofluoric acid, sulfuric acid, nitric acid and ammonium salt solution, insoluble in acetone. When dissolved in aluminum salt and iron salt solution, it forms a complex, and reacts with hot concentrated sulfuric acid to generate hydrofluoric acid. Hydrogen fluoride can be obtained by reacting Calcium Fluoride CaF2 with concentrated sulfuric acid in a lead container. Can form eutectic with a variety of metal oxides.