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hydrofluoric acid
Fluoroboric acid is the chemical compound with the formula HBF4. It is the conjugate acid of tetrafluoroborate. It is available commercially as a solution in water and other solvents such as diethyl ether.Hydrofluoric acid (HF) is a solution of hydrogen fluoride in water. While it is extremely corrosive and difficult to handle, it is technically a weak acid.(