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Hi, 

I am deciding my topics for the extended essay in chemistry and was thinking of doing something around -:

 - The effect of pH on the hydrolysis of aspirin 

         or 

 - The most effective endothermic reactions to be used in instant cold packs. (currently used water and ammonia) Please give me feedback as to how I could improve my topics and any changes that I could make to make it more suitable to the real world. 

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