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**Molecular formula:** HF
**Molar mass:** 20,006 g/mol
**Information:** Hydrogen is a highly toxic, colourless gas. It is a medium-strong acid that etches the glass. It dissolves in water into a strongly corrosive hydrofluoric acid, which dissociates into ions
(HF + H₂O → H₃O⁺ + F⁻) in diluted solutions.
**Use:** It is used in the manufacture of polymers and in the etching of glass.
