The buffer capacity is equal to:

\frac{Δ n}{Δ p H}

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\frac{p H}{Δ n}

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\pm 1 p K_{a}

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None of these

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Solution

The correct option is A $\frac{Δ n}{Δ p H}$
Buffer capacity $= \frac{n u m b e r o f m o l e s o f {O H}^{-} o r H_{3} O^{+} a d d e d}{p H c h a n g e \times v o l u m e o f b u f f e r i n L} = \frac{Δ n}{Δ p H}$

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