Hydrogen chloride is a colorless irritating gas. It can dissolve in water to make hydrochloric acid. It reacts with ammonia to make a white smoke of ammonium chloride. It is used in the making of plastics. It can form mists in air if it absorbs water. It can be made by reacting sodium chloride with sulfuric acid. It can be made by reacting hydrogen and chlorine, but the reaction is violent.