# Chapter 4, Exponential and Logarithmic Functions - Section 4.7 - Logarithmic Scales - 4.7 Exercises: 1

(a) 2.3 (b) 3.5 (c) 8.3

#### Work Step by Step

(a) $\mathrm{p}\mathrm{H}_{lemon\ juice}=-\log_{10}[\mathrm{H}^{+}]=-\log(5.0\times 10^{-3})\approx 2.3$ (b) $\mathrm{p}\mathrm{H}_{tomato\ juice}=-\log_{10}[\mathrm{H}^{+}]=-\log(3.2\times 10^{-4})\approx 3.5$ (c) $\mathrm{p}\mathrm{H}_{seawater}=-\log_{10}[\mathrm{H}^{+}]=-\log(5.0\times 10^{-9})\approx 8.3$

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