CHOSEN OPTIMUM CONDITION: pH as alpha-amylase is found in saliva, it must encounter varying pH depending on the different food consumed, thus a set optimal pH can be found to see which foods are the most effectively digested when chewing. The pH chosen will be 1,3,5,7 and 9, further can be maintained as a constant through a buffer a. Advantage : As these pH provide an equal range with not too many samples, thus saving time for at least 4 trials per pH. Disadvantage : The direct optimum rates may not be found, for example if it were a decimal, thus these ranges are not as specific, further, the optimum is found in comparison to one another rather than as an overall optimum value.