- Add the same volume of starch suspension and 0.25% amylase solution to the visking tubing.
- Rinse the outside of tubing and put in to distilled water.
- Straight war test a drop of water from around the tubing with iodine soultion with Benedicts reagent and record coulour.
- Test the water again after 15 minutes and record the colour each time.
- Repeat the experiment using other concentrations of amylasse solution.
Orangey-brown colour means theres no starch in water due to the starch molecules being too big to pass through the visking tube.
Brick-red shows theres sugar in the warer because starch as been broken down by amylase to sugar and the molecules are smaller enough to pass through membrane in to water.
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