College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 4, Exponential and Logarithmic Functions - Section 4.7 - Logarithmic Scales - 4.7 Exercises - Page 421: 4


(a) $[\mathrm{H}^{+}]=10^{-4.6}\ \mathrm{M}\approx 2.5\times 10^{-5}\ \mathrm{M}$ (b) $5.0\times 10^{-8}$ M

Work Step by Step

(a) We are given: $\mathrm{p}\mathrm{H}=-\log[\mathrm{H}^{+}]=4.6$ Therefore: $[\mathrm{H}^{+}]=10^{-4.6}\ \mathrm{M}\approx 2.5\times 10^{-5}\ \mathrm{M}$ (b) We are given: $\mathrm{p}\mathrm{H}=-\log[\mathrm{H}^{+}]=7.3$ Therefore: $[\mathrm{H}^{+}]=10^{-7.3}\ \mathrm{M}\approx 5.0\times 10^{-8}\ \mathrm{M}$
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