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Effects of substituents on the acidity of phenols: Existence of electron attracting group, (for example-NO2, -X, - NR, -CN, -CHO, -COOH) on the benzene ring increases the acidity of phenol since it enables the ring to draw much more electrons from the phenoxy oxygen and so releasing easily the proton.
pH is the measure of the acidity or alkalinity of a solution. A lower pH indicates acidity while a higher pH indicates alkalinity. A pH value of 7 is considered neutral. Research on the effects of pH on enamel suggests that low pH and high acid concentrations lead to adverse side effects such as enamel erosion.