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hydrogen halide
Hydrogen halides (or hydrohalic acids) are inorganic compounds with the formula HX where X is one of the halogens: fluorine, chlorine, bromine, iodine, and astatine.〔 Hydrogen halides are gases that dissolve in water to give acids.
==Hydrogen halides vs. hydrohalic acids==
The hydrogen halides are diatomic molecules with no tendency to ionize in the gas phase (although liquified hydrogen fluoride is a polar solvent somewhat similar to water). Thus, chemists 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 be regenerated only with difficulty, but not by normal distillation. Commonly the names of the acid and the molecules are not clearly distinguished such that in lab jargon, "HCl" often means hydrochloric acid, not the gaseous hydrogen chloride.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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