You are given 90 mL of 0.6 M of the weak base NH3 (Kb = 1.8 × 10^-5), and 1 M of the strong acid titrant HCl. a) What is the pH before any acid is added? b) What volume of acid (in mL) is needed to reach the equivalence (stoichiometric) point? c) What volume of acid (in mL) is needed to reach the halfway point where pH = pKa

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter15: Additional Aqueous Equilibria
Section: Chapter Questions
Problem 93QRT: When 40.00 mL of a weak monoprotic acid solution is titrated with 0.100-M NaOH, the equivalence...
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You are given 90 mL of 0.6 M of the weak base NH3 (Kb = 1.8 × 10^-5), and 1 M of the strong
acid titrant HCl.
a) What is the pH before any acid is added?
b) What volume of acid (in mL) is needed to reach the equivalence (stoichiometric)
point?
c) What volume of acid (in mL) is needed to reach the halfway point where pH = pKa
d) What is the pH after 50 mL of acid is added?
e) What is the pH at the equivalence (stoichiometric) point?
f) What is the pH after 60 mL of acid is added?

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