Answer
Please see the work b below.
Work Step by Step
We know that it is not necessary to have the species $NH_4OH$ to have $OH^-$ in the solution. Due to the reaction of ammonia with water, hydroxide ions are formed.
General Chemistry 10th Edition
by Ebbing, Darrell; Gammon, Steven D.
Published by
Cengage Learning
ISBN 10:
1-28505-137-8
ISBN 13:
978-1-28505-137-6
Chapter 15 - Acids and Bases - Exercises - Page 657: 15.21
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