Hydrogen halide

Hydrogen halides (or hydrohalic acids) are inorganic compounds that contain a hydrogen ion and a halide ion. The halogens are fluorine, chlorine, bromine and iodine. Astatine does not make a stable hydrogen halide, so it is not included.

The hydrogen halides are diatomic molecules with no tendency to ionize in the gas phase. Chemists therefore distinguish hydrogen chloride from hydrochloric acid. The former is a gas at room temperature that reacts with water to give the acid. Once the acid has formed, the diatomic molecule can not easily be regenerated.

compound	formula	d(H−X) / pm (gas phase)	μ / D	Notes
hydrogen fluoride	HF	91.7	1.86	Highly toxic, weak acid
hydrogen chloride	HCl	127.4	1.11	Strong acid, most common
hydrogen bromide	HBr	141.4	0.788	Strong acid
hydrogen iodide	HI	160.9	0.382	Strong acid, reducing agent

Hydrogen Halide Media

Hydrogen-astatide-2D-dimensions
Hydrogen-astatide-calculated-3D-sf

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