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Chemical Equilibrium and the Acidification of the Ocean

Chemical Equilibrium and the Acidification of the Ocean. A Chem 30 Lesson Jordan Sevenhuysen February 9 th , 2012. Chemical Equilibrium Jordan Sevenhuysen. The Problem: How does atmospheric CO 2 levels effect the pH of the ocean? What does this mean for marine organisms?.

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Chemical Equilibrium and the Acidification of the Ocean

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  1. Chemical Equilibrium and the Acidification of the Ocean A Chem 30 Lesson Jordan Sevenhuysen February 9th, 2012

  2. Chemical EquilibriumJordan Sevenhuysen The Problem: How does atmospheric CO2 levels effect the pH of the ocean? What does this mean for marine organisms? Carbon Cycle Learning Tool Ocean Acidification Grapher

  3. Chemical EquilibriumJordan Sevenhuysen CO2 and Ocean pH Applet H2O + CO2(aq)   H2CO3 HCO3–   H+ + CO32– Ka2 = 4.7×10−11 CaCO3   Ca2+ + CO32– P(CO2) = kH[CO2(aq)] H2CO3    H+ + HCO3– Ka1 = 2.5×10−4

  4. Chemical EquilibriumJordan Sevenhuysen H2O + CO2(aq)   H2CO3 Kh = 1.70×10−3 HCO3–   H+ + CO32– Ka2 = 4.7×10−11 CaCO3   Ca2+ + CO32– Ksp = 3.7×10−9 to 8.7×10−9 P(CO2) = kH[CO2(aq)] kH = 29.76 atm/(mol/L) H2CO3    H+ + HCO3– Ka1 = 2.5×10−4

  5. Chemical EquilibriumJordan Sevenhuysen Concepts Developed/Used: • Equilibrium systems • Le Chatelier’s Principle • ICE tables • Acid/Bases • Ka, Kb Main goal is to have students work with and explore equilibrium expressions and equations.

  6. Chemical EquilibriumJordan Sevenhuysen POS Objectives Unit D: Chemical Equilibrium Focusing on Acid-Base Systems • Students will explain that there is a balance of opposing reactions in chemical equilibrium systems. (General Outcome 1) • Students will identify, write and interpret chemical equations for systems at equilibrium. (30-D1.2k) • Predict, qualitatively, using Le Chatelier’s principle, shifts in equilibrium caused by changes in temperature, pressure, volume, concentration or the addition of a catalyst and describe how these changes affect the equilibrium constant. (30-D1.3k)

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