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A 0.351 L solution of 1.89 M ascorbic acid (Ka1 = 7.9e-5 and Ka2 = 1.6e-12)...

A 0.351 L solution of 1.89 M ascorbic acid (Ka1 = 7.9e-5 and Ka2 = 1.6e-12) is titrated with 1.85 M KOH. What will the pH of the solution be when 0.6419 L of the KOH has been added?

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