Q6 / 170 · Manipal (MET) 2018 · Chemistry

$\mathrm{pH}^{\prime}$ of an acid buffer is given by

  • Correct answer
    A
    $\mathrm{pH}=\mathrm{pK}_{\mathrm{a}}+\log \frac{[\mathrm{Salt}]}{[\mathrm{Acid}]}$
  • B
    $\mathrm{pH}=\mathrm{pK}_{\mathrm{a}}-\log \frac{[\text { Salt }]}{[\text { Acid }]}$
  • C
    $\mathrm{pH}=\mathrm{K}_{\mathrm{a}}+\log \frac{[\text { Salt }]}{[\text { Acid }]}$
  • D
    None of the above

Solution

pH of an acid buffer is given by Henderson equation. $\mathrm{pH}=-\log K_a+\log \frac{[\text { Salt }]}{[\text { Acid }]}$ or $\quad \mathrm{pH}=\mathrm{p} K_a+\log \frac{[\text { Salt }]}{[\text { Acid }]}$

Hence, the correct answer is option: 'A'.

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