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Earth’s Future Ocean: Acidic or Basic?

Earth’s Future Ocean: Acidic or Basic?. Miriam Sutton, M.A., NBCT Carteret County Schools Beaufort, North Carolina. Research Question. How do changes in the chemistry of the ocean affect marine organisms?. Experimental Phase I. 1 - Add 3mL of each liquid to the corresponding cup.

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Earth’s Future Ocean: Acidic or Basic?

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  1. Earth’s Future Ocean: Acidic or Basic? Miriam Sutton, M.A., NBCT Carteret County Schools Beaufort, North Carolina

  2. Research Question How do changes in the chemistry of the ocean affect marine organisms?

  3. Experimental Phase I 1 - Add 3mL of each liquid to the corresponding cup. 2 - Use pH test strips to determine the pH of each liquid. 3 - Record the pH for each liquid on your data table. 4 - Predict the level of pH that will create a chemical reaction with calcified shell fragments. Make your Prediction

  4. 1 - Add 1/2 teaspoon of shell fragments to each cup of liquid. 2 - Record your observations on your data table. Test Your Prediction Experimental Phase II

  5. Analyze Your Results 1 - Which liquid(s) resulted in a chemical reaction with the calcified shell fragments? 2 - What was the pH of the liquid(s) that resulted in a chemical reaction with the calcified shell fragments?

  6. Chemically Speaking What happened to the seashells? What’s going on chemically? Vinegar + Seashells => Crystals* + Bubbles Acetic acid + Calcium carbonate => Calcium acetate + Carbon dioxide (A double displacement chemical reaction) *Crystals will form in a few days.

  7. pH Analysis Analysis with pH scale

  8. Vinegar pH = 2.9 Seawater pH = 8.2 Trends & Predictions in Ocean pH Since the Industrial Revolution, the pH of seawater has dropped about 0.1, bringing the average seawater pH to 8.1. By 2100, the pH of seawater is predicted to drop another 0.1 - 0.35, which would result in a Seawater pH = 8.0 - 7.65

  9. Questions to Ponder Will the predicted drop in seawater pH have a detrimental effect on all marine organisms? Why or Why not? Will the change in seawater pH occur at a rate at which marine organisms can adapt? Other thoughts or questions?

  10. Additional Resources • NOAA/PMEL Carbon Group, National Oceanic and Atmospheric Administration. Ocean Acidification, What is Ocean Acidification? Seattle, WA. http://www.pmel.noaa.gov/co2/OA/background.html • NOAA: United States Department of Commerce. State of the Science FACT SHEET. Ocean Acidification. May 2008. http://www.ocean-acidification.net/OAdocs/FactSheet_en.pdf • Effects of Climate Change and Ocean Acidification on Living Marine Resources. (Scott Doney, Senior Scientist, Marine Chemistry & Geochemistry Department, Woods Hole Oceanographic Institution.) Written testimony presented to the U.S. Senate Committee on Commerce, Science and Transportation’s Subcommittee on Oceans, Atmosphere, Fisheries, and Coast Guard, May 10, 2007. http://www.whoi.edu/page.do?pid=8916&tid=282&cid=27206 • Jewett, Libby. NCCOS: Center for Sponsored Coastal Ocean Research: Proposed Initiatives – Ocean Acidification. NOAA. February 11, 2010. http://www.cop.noaa.gov/stressors/climatechange/current/ProposedInitiatives/ocean_acid.aspx

  11. Earth’s Future Ocean: Acidic or Basic? Miriam Sutton, M.A., NBCT Carteret County Schools Beaufort, North Carolina miriam.sutton@carteretk12.org 252.223.3482

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