A 25.0 mL sample of 0.150 M hydrazoic acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The K_a of hydrazoic acid is 4.50 × 10^-4. A)11.72 B)9.28 C)4.72 D)7.00 E)8.80

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Quizplus · Accepted Answer

At the equivalence point, the solution contains the conjugate base of hydrazoic acid, which will hydrolyze to form OH⁻ ions, making the solution basic. The pH can be calculated using the Kb of the conjugate base, which is derived from Kw/Ka. The pH is approximately 8.80.

A 250 ML Sample of 0