The $pK_a$ of a weak acid is defined as:

  • A
    $\log_{10} K_a$
  • B
    $\frac{1}{\log_{10} K_a}$
  • C
    $\log_{10} \frac{1}{K_a}$
  • D
    $-\log_{10} \frac{1}{K_a}$

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