A buffer solution is one which

Aresists a change in pH when a little acid or alkali is added

Bcontains equal volumes of an acid and an alkali

Chas a pH of exactly 7

Dneutralises any acid added to it

Explanation

A buffer is a mixture of a weak acid and its conjugate base (or a weak base and its conjugate acid) which mops up added

H^+

OH^-

Derived from ZIMSEC Chemistry Paper 2, November 2004, Q1

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