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Consider the titration of 50.0mL of 0.217 M hydrazoic acid (HN3, Ka=2.6 x 10^-5) with 0.183 M NaOH.  Calculate the pH of the solution after the addition of 29.7 mL of NaOH solution. Then calculate the pH of the solution after the addition of 59.3 mL of NaOH solution.

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