Doubly Sour

Chemistry Level 3

A diprotic acid H2X\text{H}_2\text{X} has K1=2.0106K_1 = 2.0\cdot 10^{-6} and K2=5.0108K_2 = 5.0\cdot 10^{-8}.

If this acid is present in a solution of pH =7\text{pH } = 7, determine the ratio [X2][H2X].\dfrac{[\text{X}^{2-}]}{[\text{H}_2\text{X}]}.

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