When HSO3- is gone, reaction B takes over and I3- and starch immediately react to form the blue complex. and add to boiling water. Allow solution to cool to room temperature and add 0.8gNaHSO3 (sodium ...

Independent variable - pH level Dependent variable - Time taken for starch to be broken down. Control variables - Temperature, volume and concentrations of enzyme solution and starch solution.

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The green parts contain chlorophyll and photosynthesise to make starch. The white part of the ... Only the uncovered parts become blue/black with iodine solution, showing the importance of light ...