... be controlled by using syringes that are accurate to the measurements being used i.e. the smallest syringe for the measurement. For example, I will be measuring 5cm³ of diastase so the most accurate syringe I could use is a 5cm³ syringe. Concentration of starch This must not change because the variable I have decided to change is the concentration if diastase and two variables cannot change if a fair test us being carried out. This will be controlled by taking my diastase solution from the same batch so that any slight changes from batch to batch do not need to be accounted for. pH This must remain the same because the pH has an affect on enzymes were it distorts the 3D structure. If the enzyme was denatured by pH then the whole experiment would be ruined. This is controlled because the pH of all the solutions remains the same. Time The time intervals at which ...

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