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Hydrofluoric acid is a solution of hydrogen fluoride in water.
Solutions of HF are colourless, acidic and highly corrosive.

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Unlike other hydrohalic acids, such as hydrochloric acid, hydrogen fluoride is only a week acid in dilute aqueous solution.

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In dilute aqueous solution hydrogen fluoride behaves as a weak acid.
H2O + 2 HF ⇌  H+ + F− + H3O+⋅F−
pKa = 3.17

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The  principal use of hydrofluoric acid is in organofluorine chemistry. Many organofluorine compounds are prepared using HF as the fluorine source, including Teflon, fluorocarbons, and refrigerants such as freon. Many pharmaceuticals contain fluorine.

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“Hydrofluoric Acid.” Wikipedia, Wikimedia Foundation, 1 Aug. 2021, https://en.wikipedia.org/wiki/Hydrofluoric_acid.

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The Global Anhydrous Hydrofluoric Acid Market report provides segmentation, business areas, growth opportunities, current developments, market prospects, and valuable market forecast estimation. The Top Major Competitive Players are: Honeywell, Solvay, Ineos, Derivados del Flúor, Airproducts, Morita

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Hydrofluoric Acid Alkylation Units, often referred to as HF Alky units, are process units used in petroleum refining to convert isobutane and alkenes into alkylate, which is used to make gasoline.

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Used to clean silicon wafers. In a similar manner it is also used to etch glass by treatment with silicon dioxide to form gaseous or water-soluble silicon fluorides. It can also be used to polish and frost glass.
SiO2 + 4 HF → SiF4(g) + 2 H2O
SiO2 + 6 HF → H2SiF6 + 2 H2O

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In addition to being a highly corrosive liquid, hydrofluoric acid is also a powerful contact poison. Because of the ability of hydrofluoric acid to penetrate tissue, poisoning can occur readily through exposure of skin or eyes, or when inhaled or swallowed. Symptoms of exposure to hydrofluoric acid may not be immediately evident, and this can provide false reassurance to victims, causing them to delay medical treatment.