Answer
100,000
Work Step by Step
To get this answer, see the difference in pH = 9-4 = 5 units. Each unit represents a ten fold change in concentration, so $10^{5}$=100,000 fold.
Campbell Biology (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 3 - 3.3 - Concept Check - Page 53: 1
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