Proton affinity

Acid-base extraction
Acid-base reaction
Acid-base physiology
Acid-base homeostasis
Acid dissociation constant
Acidity function
Buffer solutions
pH
Proton affinity
Self-ionization of water
Acids:
- Lewis acids
- Mineral acids
- Organic acids
- Strong acids
- Superacids
- Weak acids
Bases:
- Lewis bases
- Organic bases
- Strong bases
- Superbases
- Non-nucleophilic bases
- Weak bases

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The proton affinity, E_pa, of a anion or of a neutral molecule is a measure of its gas-phase basicity. It is the energy released in the following reactions:^[1]

A⁻ + H⁺ → HA

B + H⁺ → BH⁺