The key difference between weak bases and strong bases lies in their degree of ionization in water.
- Strong bases completely dissociate in aqueous solution, producing a large number of hydroxide ions (OH⁻).
- Weak bases only partially dissociate, meaning fewer OH⁻ ions are released.
Comparison:
- Ionization:
- Strong bases → Complete ionization
- Weak bases → Partial ionization
- OH⁻ ion concentration:
- Strong bases → High
- Weak bases → Low
- Electrical conductivity:
- Strong bases → High (more free ions)
- Weak bases → Lower
- pH value:
- Strong bases → Higher pH (closer to 14)
- Weak bases → Moderately basic pH
Examples:
- Strong base: Sodium hydroxide (NaOH)
- Weak base: Ammonia (NH₃)
Chemical representation:
- Strong base: NaOH → Na⁺ + OH⁻
- Weak base: NH₃ + H₂O ⇌ NH₄⁺ + OH⁻
In simple terms:
Strong bases fully break apart in water, while weak bases only partially react, making them less powerful in comparison.