Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 4 - Inverse, Exponential, and Logarithmic Functions - 4.4 Evaluation Logarithms and the Change-of-Base Theorem - 4.4 Exercises - Page 457: 42

Answer

“rich fen.”

Work Step by Step

With $[H^+]=5.86\times10^{-7}$, we have $pH=-log[H^+]=-log(5.86\times10^{-7})=7-log5.86\approx6.2$. Based on the definition, this value indicates a “rich fen.”
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