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Acid–base models and buffer response

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One reaction, two models

A Brønsted–Lowry acid donates a proton and a Brønsted–Lowry base accepts one. A Lewis base donates an electron pair and a Lewis acid accepts one.

Chemistry: NH₃ + H₂O ⇌ NH₄⁺ + OH⁻

Buffer response

Equation: A⁻ + H⁺ → HA. The conjugate base consumes added proton to form the weak acid; the model does not imply fixed pH or unlimited buffer capacity.

Check

In NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, NH₃ and NH₄⁺ are a conjugate pair because they differ by one proton.

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