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Acceptable SL Chemistry IA topic?

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So, I have somewhat an idea of what id like to do involving my chemistry IA but I'm in need of an opinion and or suggestions.

My idea is an experiment testing the affects of Carbonic acid (due to ocean acidification) on shelled organisms and others that use calcium carbonate. Perhaps testing at which concentration it is harmful? I dont have a specific or elaborate idea and am struggling to think of one all i know is that this topic is important to me and the world itself. 

All suggestions welcome please!

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One of my seniors did a similar IA on which shells broke down the most in carbonic acid or something along those lines. He used eggshells of chicken, ducks, and something else I can't remember. Basically he (I think) weighed them after immersion every day for a period of time. It worked out really well, he got a level 7. I think the topic's super interesting. Good luck! :)

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