Brønsted-Lowry base

A proton acceptor.

For example:

OH⁻(aq) + H⁺(aq) → H₂O(l)

(the hydroxide ion is a strong base)

NH₃(aq) + H⁺(aq) ⇌ NH₄⁺(aq)

(ammonia is a weak base)

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