In a saturated solution of $Mg(OH)_2$,the degree of dissociation of $Mg(OH)_2$ is $\alpha$. Find the concentration $(C)$ of $Mg(OH)_2$ if the concentration of $[OH^{-}]$ is $2$.

  • A
    $\alpha$
  • B
    $2\alpha$
  • C
    $1/\alpha$
  • D
    $1/(2\alpha)$

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