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: 3


(a) $[\mathrm{H}^{+}]=10^{-3}\ \mathrm{M}$ (b) $[\mathrm{H}^{+}]=10^{-6.5}\approx 3.2\times 10^{-7}\ \mathrm{M}$

Work Step by Step

(a) We are given: $\mathrm{p}\mathrm{H}=-\log[\mathrm{H}^{+}]=3.0$ Therefore: $[\mathrm{H}^{+}]=10^{-3}\ \mathrm{M}=0.001\ \mathrm{M}$ (b) We are given: $\mathrm{p}\mathrm{H}=-\log[\mathrm{H}^{+}]=6.5$ Therefore: $[\mathrm{H}^{+}]=10^{-6.5}\approx 3.2\times 10^{-7}\ \mathrm{M}$
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