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IA Question (faulty results)

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Unsure if this is the right place to ask this, but I have a result related problem for my IA. My topic is calculating KC for the hydrolysis of ethyl ethanoate, with titration as the chosen method. The concentration of ethyl ethanoate and water varied between different trial, but as the equilibrium law states only temerature should affect pH. However, when I calculated Kc for the different trials I ended up with five quite different values where the general trend as that Kc decreased as concentration of ethyl ethanoate decreased. I have no idea why this happened....is there any chemistry gurus out there who might know what can have happened?

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