Hydrogen halide

In chemistry, hydrogen halides (hydrohalic acids when in the aqueous phase) are diatomic, inorganic compounds that function as Arrhenius acids. The formula is HX where X is one of the halogens: fluorine, chlorine, bromine, iodine, astatine, or tennessine. All known hydrogen halides are gases at standard temperature and pressure.

Compound Chemical formula Bond length
d(H−X) / pm
(gas phase)		 model Dipole
μ / D		 Aqueous phase (acid) Aqueous Phase pKa values
hydrogen fluoride
(fluorane)		 HF 1.86 hydrofluoric acid 3.1
hydrogen chloride
(chlorane)		 HCl 1.11 hydrochloric acid −3.9
hydrogen bromide
(bromane)		 HBr 0.788 hydrobromic acid −5.8
hydrogen iodide
(iodane)		 HI 0.382 hydroiodic acid −10.4
hydrogen astatide
astatine hydride
(astatane)		 HAt −0.06 hydroastatic acid ?
hydrogen tennesside
tennessine hydride
(tennessane)		 HTs −0.24 ? hydrotennessic acid ?
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