A compound of a halogen element and hydrogen. There are four types: hydrogen fluoride (HF), hydrogen chloride (HCl), hydrogen bromide (HBr), and hydrogen iodide (HI). All are produced by the direct reaction of a halogen with hydrogen. At room temperature, all are colorless, fuming gases, with boiling points of hydrogen fluoride at 19.5°C, hydrogen chloride at -85°C, hydrogen bromide at -68.7°C, and hydrogen iodide at -35.7°C. All are highly soluble in water, producing hydrofluoric acid, hydrochloric acid, hydrobromic acid, and hydroiodic acid, respectively. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
ハロゲン族元素と水素との化合物をいう。フッ化水素 HF ,塩化水素 HCl ,臭化水素 HBr ,ヨウ化水素 HI の4種がある。いずれもハロゲンと水素との直接反応によって生成する。常温ではすべて無色発煙性の気体で,沸点はフッ化水素 19.5℃,塩化水素-85℃,臭化水素-68.7℃,ヨウ化水素-35.7℃である。いずれも水によく溶け,それぞれフッ化水素酸,塩酸,臭化水素酸,ヨウ化水素酸を生じる。
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