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Q)

Which of the following is correct for acid buffer ? [ salt = S, acid = A ] :


( A ) $pK_a = pH - \frac{[A]}{[S]}$
( B ) $pH = pK_a + \log \frac{[S]}{[A]}$
( C ) $pH = pK_a + \log \frac{[A]}{[S]}$
( D ) $pK_a = pH + \log \frac{[S]}{[A]}$

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