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hydrofluoric acid[¦hī·drə′flu̇r·ik ′as·əd]
an aqueous solution of hydrogen fluoride, HF. Hydrogen fluoride is soluble in water in any proportions. The azeotropic mixture contains 38.26 percent HF and has a boiling point of 112°C (750 mm Hg) and a density of 1.138 g/cm3. Hydrofluoric acid reacts with oxides to form fluorides. It dissolves fluorides, forming complex compounds with them; it reacts vigorously with silicate materials, especially glass. It is used as a solvent and as a reagent in the preparation of fluorides; it is also used for etching glass.