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A student is investigating the effect of pH on amylase activity using starch and iodine solution. They observe the following times for the iodine solution to stop turning blue-black: | pH | Time (s) | Trial 1 | Trial 2 | Trial 3 | |----|----------|---------|---------|---------| | 6 | | 60 | 62 | 58 | | 7 | | 40 | 38 | 42 | | 8 | | 50 | 55 | 53 | | 9 | | 120 | 130 | 118 | Calculate the mean rate of reaction for each pH and identify the optimum pH for amylase activity based on these results. Support your answer with calculations. [5 marks].
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