The hydrogen ion concentration in weak acid of dissociation constant ${K_a}$ and concentration $c$ is nearly equal to

  • [AIPMT 1989]
  • A

    $\sqrt {{K_a}c} $

  • B

    $c/{K_a}$

  • C

    ${K_a}c$

  • D

    $\sqrt {{K_a}/c} $

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