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Biology - effect of pH on catalase- HELP! watch

    Ok, as far as i know, the optimum pH of catalase is 7.5, right? So why am i getting a really fast rate for pH 11? Look at my average results:

    pH Average time (mins)
    3 20.32
    5 7.84
    7 6.62
    9 7.11
    11 6.9

    Please someone explain to me why the rate at pH 11 is so high- is the buffer reacting with the hydrogen peroxide or something?

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