Buff contains a weak acid weak base and its conjugate acid because they do not undergo any reaction that significantly alters their concentration.
Buff solution:
Buffers are solutions that maintain a relatively constant pH when an acid or a base is added. Weak acids or conjugate bases can react with strong acids or bases to prevent sharp, sudden changes in pH.
A buffer solution contains a weak acid weak base and its conjugate acid because they do not undergo any reaction that significantly alters their concentration. Such a solution has the capability to withstand the pH change upon the addition of strong acids or bases.
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