Paper 2 · acid-base equilibria and buffers

A buffer solution is one which

Ahas a pH of exactly 7

Bneutralises any acid added to it

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

Dcontains equal volumes of an acid and an alkali

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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