2 Acid Test Copyright © 2026 Pearson Education, Inc. 4. Suppose that rain normally has pH = 5.6 and rain with pH = 4.6 is considered acid rain. a. At least how many times more acidic than normal is acid rain? b. If the pH of a water sample is 2.6, how much more acidic is it than normal rain? 5. Two lakes are tested for acid rain damage. Pine Lake has a hydrogen ion concentration of 3.16 ×10–4 mol/L. Silver Lake has a pH of 3.8. a. What is the pH of Pine Lake? Round your answer to the nearest tenth. b. Which lake is more acidic? Discuss your reasoning with your partner. 6. A student says, “Since pH 2 is only 2 less than pH 4, it must be just a little bit more acidic.” a. Is this reasoning correct? Why or why not? b. How many times more acidic is pH 2 than pH 4?
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