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First dissociation of phosphoric acid

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Phosphoric acid is a diprotic acid, and a 0.20 M, 50.0 mL sample is titrated with 12.5 mL of 0.100 M potassium hydroxide to reach the first equivalence point, where the first acid dissociation constant (ka1) = 7.25 x 10^-3 M at 25 degrees Celsius. An additional 12.5 mL, 0.100 M of potassium hydroxide is added to reach the second equivalence point, where the second acid dissociation constant is (Ka2) = 6.31 x 10^-8 M at 25 degrees Celsius.

  • Write the balanced chemical equation including al phases of the first dissociation of phosphoric acid and Calculate the PH at the first equivalence point
  • Write the balanced chemical equation including all phases of the second dissociation of phosphoric acid and Calculate the pH at the second equivalence point

Reference no: EM131069228

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