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Objective: We will understand that

Objective: We will understand that. Coral reefs need a certain pH to survive Human alterationsof the atmosphere are changing the pH of the ocean Test whether increased carbon dioxide is making our oceans more basic or more acidic Learn how a change in oceanic pH is impacting coral reefs.

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Objective: We will understand that

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  1. Objective: We will understand that • Coral reefs need a certain pH to survive • Human alterationsof the atmosphere are changing the pH of the ocean • Test whether increased carbon dioxide is making our oceans more basic or more acidic • Learn how a change in oceanic pH is impacting coral reefs.

  2. Ponder this: • What do you think your breath is? Acid or base or neutral? • Write your answer and think.. • How can you test your prediction?

  3. What is a pH indicator? • A pH indicator turns color in presence of acid or base. • cabbage juice is purple. It turns pink in presence of acid. It turns blue in presence of base. • Bromthymol blue is another type of indicator. • Bromthymol blue solution turns yellow or green in presence of acid.

  4. Develop a Hypothesis • Will my breath turn bromthymol blue yellow or green? • If so, my breath is _____ • If the bromthymol blue stays blue, my breath is _______ • Hypothesis: If I breathe into bromthymol blue, the solution will _____

  5. Materials: Test Tube, straw, bromthymol blue solution • Procedure: Put 10 ml of water into a test tube • add 3-4 drops of bromthymol blue • Place a straw in test tube and return to your seat.

  6. All animals, including the dinosaurs of Jurassic times and we humans, are part of the carbon cycle. Some of the carbon dioxide in the atmosphere dissolves and is stored in ocean waters. The oceans act as a storage place or sink for carbon. What in your breath is acidic? ____

  7. What is a source? What is a sink?

  8. The Carbon Cycle

  9. Biogeochemical Cycle Carbon Cycle • By eating food, animals gain carbon in the form of carbohydrates and proteins. • In each of our bodies' cells, oxygen combines with food to give energy for daily activity. Carbon dioxide, a waste product of this cellular metabolism, is released back into the atmosphere when we exhale or breathe. • Some of the carbon dioxide in the atmosphere dissolves and is stored in ocean waters. The oceans act as a storage place or sink for carbon.

  10. Seawater and pH • If sea water has a pH of 8, is it slightly acidic or slightly basic? • What might change the pH of sea water?

  11. Corals and pH

  12. Corals are animals, related to anemones and jellyfish. Corals consist of a limestone structure filled with thousands of small animals called polyps. Each polyp has a tentacles with stinging cells, a mouth and stomach. What is coral?

  13. Warm water Salinity Sunlight Clear water Slightly basic pH What do corals need to survive?

  14. Where in the world are coral?

  15. What is the effect of acid on coral? • Acids dissolve carbonates (CaCO3). • What is made of carbonate? • 2HCl + CaCO3 ↔ CaCl2 + CO2 + H2O • Hydrochloric Acid + Calcium Carbonate ↔ • Calcium Chloride + Carbon Dioxide +Water

  16. Respiration Fossil fuel emissions Volcanic eruptions What is the source of the Carbon Dioxide? What is the sink?

  17. What is the effect of lower pH on coral and other marine animals with carbonate shells and exoskeletons?

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