A diprotic acid \(\text{H}_2\text{X}\) has \(K_1 = 2.0\cdot 10^{-6}\) and \(K_2 = 5.0\cdot 10^{-8}\).

If this acid is present in a solution of \(\text{pH } = 7\), determine the ratio \[\dfrac{[\text{X}^{2-}]}{[\text{H}_2\text{X}]}.\]

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