Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning
ISBN 10: 1285199049
ISBN 13: 978-1-28519-904-7

Chapter 15 - Additional Aqueous Equilibria - Questions for Review and Thought - Topical Questions - Page 693b: 35b


Phenolphthalein is the most suitable indicator for this titration, because this indicator changes its color with pH values between 8.3 and 11, so it is the better choice.

Work Step by Step

Acetic acid is weak and $KOH$ is strong; therefore, the pH at the equivalence point of the titration will be basic $(pH > 7)$. Analyzing the 3 given indicators on page 667, the one where the color changes in a basic solution is the most appropriate, so Phenolphthalein is the correct answer.
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