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======Ocean Acidification======


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/* GREY BOX INFORMATION - Required                                                                     */
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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Categories:** {{$demo.categories}}
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**Alternative titles:** 
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/* SUMMARY - Required                                                                                  */
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====Summary====                   
{{$demo.summary}}


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/* PROCEDURE - Optional                                                                                */
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====Procedure====  
  - Fill two beakers with tap water.
  - Add several drops of a pH indicator (aquarium indicator, phenolphthalein or bromothymol blue) to each beaker.
  - To the first beaker, add a few drops of vinegar to show how an acid lowers pH (solution turns yellow).
  - Sprinkle baking soda into the same beaker to show how a base raises pH (solution turns blue).
  - Explain the indicator color changes in terms of acid–base reactions.
  - Blow gently through a straw into the second beaker for about 30 seconds.
  - Observe the color shift, indicating the water has become acidic due to dissolved carbon dioxide.


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====Links==== 
Ocean Acidification Demo - ElCheJaimito56: 
{{youtube>pTTuTLy46pE?}}\\
📄 Ocean acidification - ABC Science: [[https://www.abc.net.au/science/articles/2011/02/24/3147423.htm]]\\


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====Variations====
  * Use different indicators, including aquarium indicator, phenolphthalein or bromothymol blue.
  * Compare the effect of exhaled air with air from a balloon (ambient air) to highlight the role of CO₂ concentration.
  * Use seawater samples instead of tap water to make the demonstration more realistic.


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====Safety Precautions====
  * Avoid ingesting indicator solution.
  * Dispose of solutions safely in a sink with plenty of water.
  * Blow gently through straws to prevent splashing.


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====Questions to Consider====
  * What gas in exhaled breath is responsible for lowering the water’s pH?
  * How does the change in pH relate to what is happening in the oceans today?
  * Why are organisms with calcium carbonate shells particularly vulnerable to ocean acidification?
  * What is the difference between short-term pH changes in small systems (like a beaker) and long-term changes in the global ocean?
  * Why is the rate of pH change in the oceans more concerning than the absolute pH level?


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