sentence: Chemists therefore distinguish hydrogen chloride from hydrochloric acid.
sentences_before: The hydrogen halides are diatomic molecules with no tendency to ionize in the gas phase.
sentences_after: 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.
concept_name: chemist
headings: Hydrogen halide
categories: Hydrogen compounds