Hydrofluoric Acid and Sodium Hydroxide

概要

Hydrofluoric acid, despite being a weak acid (Ka = 6.8 × 10⁻⁴), reacts completely with sodium hydroxide to form sodium fluoride and water. HF is unusually dangerous among weak acids because it penetrates skin and causes deep tissue burns by binding calcium ions in bones. The high heat of neutralization reflects the strong H-F bond.

参加者

日常の例

Sodium fluoride from this reaction is the form of fluoride added to municipal water supplies and toothpaste for dental protection.

産業上の重要性

フッ化水素酸はガラスエッチング、半導体製造、石油精製、ウラン濃縮処理に不可欠である。フッ化ナトリウムは水道水フッ素添加、歯磨き粉、殺虫剤に利用される。