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Table 2. Indicator Reagent DataIndicatorStarch Positive/(color)Starch SolutionLight yellowDistilled waterLight purpleTable 3. Diffusion of Starch Over TimeInitial ColorFinal ColorPresence of StarchDialysis Bag /( Starch solution)clearpurpleNoWater in BeakerClear blueLight brownNoPost-Lab Questions1.Why is it necessary to have positive and negative controls in this experiment?2.Did starch diffuse across the selectively permeable membrane? How do you know?3.Did IKI diffuse across the selectively permeable membrane? How do you know?4.Which molecule is smaller starch or iodine?
5.Is diffusion a passive or an active process (choose one)?
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Biology,10 minutes,Semipermeable membrane,4 mls,15,000 g