The pH of a buffer solution changes only slightly with addition of a small amount of acid or base.

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A buffer solution is composed of a weak acid and its conjugate base, or a weak base and its conjugate acid. It can resist changes in pH when small amounts of acid or base are added, often by consuming or releasing H+ ions. This property allows it to maintain a stable pH, making it useful in many biological and chemical applications.

The PH of a Buffer Solution Changes Only Slightly with Addition