2 Acid Test Copyright © 2026 Pearson Education, Inc. Acid Test (50 – 60 minutes) Learning Objective(s): ● Students will be to model and solve problems involving logarithmic functions. Materials needed: ● Student pages: Acid Test ● Calculator Lesson Procedure: Warm–Up 10 minutes Prompt: Logarithms increase or decrease very quickly and then level off. What are some real-world scenarios that could be modeled with logarithms? Discuss: applications of logarithms Guided Instruction 15 minutes Present: scenario for Acid Test Example: What is log5(0.2)? –1 Graph y = log5(x). Review: Logarithms are related to exponential functions. The base of the logarithm, to the power of the other side of the equation, equals what is inside the logarithm. Independent Practice 20 minutes Distribute: student activity Acid Test Allow students to work individually or in pairs. Closure 10–15 minutes Review Answers: 1. a. 2; b. 1.3; c. 4; When the concentration goes down 10 times, pH goes up 1. 2. a. 10; b. 10,000 3. a. 0.00001 mol/L; b. 3 4. a. 10 times; b. 1,000 times 5. a. 3.5; b. Pine Lake, pH of 3.5 is lower than the pH of Silver Lake making Pine Lake more acidic. 6. a. No, the pH scale is logarithmic, so each unit change represents a 10x difference; b. 100 times Discuss: Why is using logarithms useful for discussing pH? (You can use small numbers rather than decimals with many digits or scientific notation.)
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