An acidic buffer has the maximum buffer capacity when:

[A c i d] > [S a l t]

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[A c i d] = [S a l t]

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[A c i d] < [S a l t]

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[A c i d] = 2 \times [S a l t]

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Solution

The correct option is B $[A c i d] = [S a l t]$
Maximum capacity is when $p H = p k a$ .
$∴ p H o f b u f f e r = p k a + l o g \frac{[s o l t]}{[a c i d]}$
For $p H = p k a$ ,
$l o g \frac{[S a l t]}{[A c i d]} = 0$
$∴ [S a l t] = [A c i d]$

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