Identify the conjugate acid and conjugate base for the $HCO_3{ }^{-}$ ion,respectively.

  • A
    $CO_3{ }^{2-}$ and $H_2CO_3$
  • B
    $H_2CO_3$ and $CO_2$
  • C
    $CO_2$ and $H_2CO_3$
  • D
    $H_2CO_3$ and $CO_3{ }^{2-}$

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