Answer
The effective pH range of a buffer is pK$_a$ +/-1.
Work Step by Step
This is because buffer components should not differ by more than a factor of 10.
Chemistry: A Molecular Approach (3rd Edition)
by Tro, Nivaldo J.
Published by
Prentice Hall
ISBN 10:
0321809246
ISBN 13:
978-0-32180-924-7
Chapter 16 - Sections 16.1-16.8 - Exercises - Review Questions - Page 803: 9
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