Hydrogen halide

Hydrogen halides (or hydrohalic acids) are inorganic compounds that contain a hydrogen atom and a halogen atom. 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  structure  model  d(H−X) / pm(gas phase)  μ / D  Notes hydrogen fluoride  HF  68px  45px  91.7  1.86  Highly toxic, weak acid hydrogen chloride  HCl  95px  70px  127.4  1.11  Strong acid, most common hydrogen bromide  HBr  108px  72px  141.4  0.788  Strong acid hydrogen iodide  HI  110px  84px  160.9  0.382  Strong acid, reducing agent

Category:Hydrogen compounds
Category:Binary acids
Category:Halides