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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.
The acidity of foods, or other substances, are measured by their pH value -- their place on a 14-point pH scale. Acidic substances have a low pH -- the lower the pH, the more acidic -- while neutral and basic substances have higher pH levels of 7 or above.The body has a pH balance that determines the amount of acid and alkalinity present in your system.cidic substances have a low pH -- the lower the pH, the more acidic -- while neutral and basic substances have higher pH levels of 7 or above. The body has a pH balance that determines the amount of acid and alkalinity present in your system.