Chemistry

Problem

An unknown monoprotic acid, HX, has an acid-dissociation constant

K_a = 7.2 \times 10^{-4}

25\,^{\circ}\text{C}

. A

25.0\,\text{mL}

sample of

0.150\,\text{M}

HX is titrated with

0.300\,\text{M}

NaOH to the equivalence point. (a) Calculate the volume of NaOH solution needed to reach the equivalence point. (b) Determine the pH of the solution exactly at the equivalence point. Show all work leading to your numerical answer.

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