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  1. The acid dissociation Ka of benzoic acid C6H5CO2H is  6.3 x 10-5. Calculate the pH of a 1.2 x 10-3aqueous solution of benzoic acid. Round your answer to 2 decimal places.
  2. Suppose a 0.33 aqueous solution of phosphoric acid (H3PO4) is prepared. Calculate the equilibrium molarity of HPO4-2.

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