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Planning for the investigation; Treating Starch.

Hypothesis: - Starch will break down at pH 6 and 7, faster than if you use the other pH.

Independent Variable:
The different concentration, of the buffer solution. Another independent variable is the amount of
mixture you use, so amylase, starch, the buffer solution.…

Page 2

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7. After 10 seconds, use the pipette to place one drop of the mixture onto the first drop of
iodine. The iodine solution should turn into a black-blue colour. Squirt the rest of the
solution, back into the test tube.
8. Wait another 10 seconds. Then add a second drop…

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