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The phenomenon being discussed that affects the shells of organisms is oceanacidification. Based on what you know about pH, do you think “acidification” refers to adecrease in pH or an increase in pH? Explain2. Why do you think that this drop in pH occurred after the Industrial Revolution?3. Explain how more carbon dioxide in the atmosphere can cause the pH of the ocean todecrease.4. Based on what you know about chemical equilibrium, what would have to occur for theacidification of the oceans to be reversed? Explain your answer.Directions: Answer each “reflection” question when it appears at the bottom of a lessonpage.

Question

The phenomenon being discussed that affects the shells of organisms is oceanacidification. Based on what you know about pH, do you think “acidification” refers to adecrease in pH or an increase in pH? Explain2. Why do you think that this drop in pH occurred after the Industrial Revolution?3. Explain how more carbon dioxide in the atmosphere can cause the pH of the ocean todecrease.4. Based on what you know about chemical equilibrium, what would have to occur for theacidification of the oceans to be reversed? Explain your answer.Directions: Answer each “reflection” question when it appears at the bottom of a lessonpage.

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Solution

  1. "Acidification" refers to a decrease in pH. The pH scale measures how acidic or basic a substance is and ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic, and a pH greater than 7 is basic. Therefore, when we talk about "acidification," we're talking about the process of becoming more acidic, which means the pH is decreasing.

  2. The drop in pH occurred after the Industrial Revolution because of the significant increase in the burning of fossil fuels. This process releases carbon dioxide (CO2) into the atmosphere. Some of this CO2 is absorbed by the oceans, leading to an increase in their acidity.

  3. More carbon dioxide in the atmosphere can cause the pH of the ocean to decrease because when CO2 is absorbed by seawater, a series of chemical reactions occur resulting in the increased concentration of hydrogen ions. This increase causes the seawater to become more acidic and causes the decrease in sea water pH.

  4. To reverse the acidification of the oceans, the amount of CO2 in the atmosphere would need to decrease significantly. This is because the process of ocean acidification is driven by the equilibrium between CO2 in the atmosphere and CO2 in the ocean. If the amount of atmospheric CO2 decreases, the equilibrium will shift to reduce the amount of CO2 in the ocean, thereby reducing its acidity. This could be achieved through methods such as reducing CO2 emissions, increasing carbon sequestration, or artificially removing CO2 from the atmosphere.

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