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Chemistry IA Idea on pH level and corrosion rate


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I was planning to do my HL chemistry database IA on the relationship between corrosion rate and pH level such as the difference between corrosion rate of steel when reacted with ocean water and rain water, but my teacher told me it is too simple and the answer is obvious. Are there any other factors I can or should add to my paper to make it complex enough? Or should I change my topic completely? 

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