What solution can simulate ocean acidification for a classroom demonstration?

In summary, the conversation discusses the idea of a classroom demonstration using plaster of paris shells dissolving in a low pH solution to simulate ocean acidification. The speaker is looking for a solution that will quickly dissolve the shells in front of the class, with a visual representation of low pH. They also mention the use of Bromothymol blue dye and the preference for an odorless or low odor solution. The purpose of the demonstration is to show how the ocean's buffer system resists changes in pH, and the suggestion is made to use calcium carbonate and dilute acetic acid instead.
  • #1
Teacher in Suquamish
I would like to do a classroom demonstration using plaster of paris (or something similar) shells dissolving in a low pH solution, simulating ocean acidification.

I would like the reaction to happen quite quickly in front of the classroom. What solution could I use to dissolve plaster of paris quickly? It doesn't have to be low pH, but visually simulating it. This will accompany another experiment using Bromothymol blue dye, so I will color the solution yellow. It would be great if the solution was odorless or low odor...
 
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  • #2
What would be the purpose of the demonstration? The ocean is one heck of a buffer system, and resists small changes in pH. Using an acidic solution near the pH of the ocean would be a very boring exercise. If you want to demonstrate dissolution of seashells, use calcium carbonate and a dilute acetic acid solution.
 

1. What is ocean acidification activity?

Ocean acidification activity refers to the process by which the pH levels of the ocean decrease due to the absorption of excess carbon dioxide from the atmosphere. This leads to a decrease in the concentration of carbonate ions, which are essential for the formation of shells and skeletons of marine organisms.

2. What causes ocean acidification activity?

The main cause of ocean acidification activity is the increase in carbon dioxide levels in the atmosphere. This is primarily due to human activities such as burning fossil fuels, deforestation, and industrial processes. The excess carbon dioxide is absorbed by the ocean, leading to a decrease in pH levels.

3. What are the effects of ocean acidification activity?

Ocean acidification activity can have significant impacts on marine life and ecosystems. It can hinder the ability of marine organisms to build and maintain their shells and skeletons, making them more vulnerable to predators and other stressors. It can also disrupt the food chain, affecting the entire marine ecosystem.

4. How can we measure ocean acidification activity?

Scientists measure ocean acidification activity by monitoring the pH levels of the ocean over time. This is typically done through a combination of direct measurements using sensors and remote sensing techniques such as satellite observations. Other indicators, such as changes in the concentration of carbonate ions and the saturation state of calcium carbonate, can also be used to measure ocean acidification activity.

5. What can be done to mitigate ocean acidification activity?

To mitigate ocean acidification activity, we need to reduce our carbon emissions and limit the amount of carbon dioxide that is being absorbed by the ocean. This can be achieved through efforts to reduce fossil fuel use, promote renewable energy sources, and implement sustainable practices in industries. Additionally, protecting and restoring marine ecosystems can also help to mitigate the impacts of ocean acidification activity on marine life.

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