Protonation is the addition of a hydrogen ion to a substance. A hydrogen atom normally contains 1 proton and 1 electron. When the hydrogen atom is oxidized, it loses its electron, leaving a H⁺. The H⁺ is the same as a proton. Substances are protonated when hydrogen ions are added to them. For example, when ammonia (NH₃) is protonated, it forms ammonium ions, NH₄⁺. A substance is protonated by a substance more acidic than it. The acidic substance is deprotonated.

• Deprotonation
• Proton
• Hydrogen

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