An analytical chemist is titrating 242.9mL of a 0.6000M solution of hydrazoic acid HN3 with a 0.8300M solution of KOH .

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An analytical chemist is titrating
242.9mL
of a
0.6000M
solution of hydrazoic acid
HN3
with a
0.8300M
solution of
KOH
. The
pKa
of hydrazoic acid is
4.72
.Calculate the pH of the acid solution after the chemist has
added
139.4mL
of the
KOH
solution to it.
Note for advanced students: you may assume the
final volume equals the initial volume of the solution plus the
volume of
KOH
solution added.
Round your answer to
2
decimal places.