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Educational Objectives

Educational Objectives. To understand how the pH level of an environment affects living organisms. To understand the relationship between the pH level and CO 2 concentration of distilled water. What is Acid Rain.

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Educational Objectives

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  1. Educational Objectives • To understand how the pH level of an environment affects living organisms. • To understand the relationship between the pH level and CO2 concentration of distilled water.

  2. What is Acid Rain • Formed when gases, such as NOx and SO2 react with the water in the atmosphere • The pH of Rain drops • As low as pH of 2 • Very harmful to our living environment

  3. Examples • When SO2 reacts with water, sulfurous acid is formed. SO2 (g)+H2O(l)-H2SO3(aq) • When NO2 reacts with water, nitric acid is formed. 2NO2(g)+H2O(l)-HNO2(aq)+HNO3(aq) • When CO2 reacts with water, carbonic acid is formed. CO2 (g)+H2O(l)-H2CO3(aq)

  4. How does Acid Rain affect us • It kills micro-organisms • It poisons plants • It damages metals and limestone • It kills fish

  5. Procedures • Record the pH of distilled water by using the pH paper • Add three drops of bromothymol blue indicator to the flask • Record the color of the water before starting • BLUE = base GREEN = neutral YELLOW = acid • Using a straw, carefully blow into the water for one minute • Record the final color of the water

  6. Questions • Why do we blow ‘air’ into the water? What are we really mixing the water with? • What changes in pH do you expect? • Is this a good simulation to the Acid Rain formation? Explain.

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