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A sample of carbonic acid (0.125 L, 0.165 M, pKa1 = 6.35, pKa2 = 10.33) was titrated with 1.53 M NaOH. Calculate the pH at the following points:

Before the titration. At the 1st midpoint. At the 1st stoichiometric point.

At the 2nd midpoint. At the 2nd stoichiometric point.

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